Publications by authors named "Zhuo Wu"

53 Publications

Assessment of quantitative dynamic contrast-enhanced MRI in distinguishing different histologic grades of breast phyllode tumor.

Eur Radiol 2021 Sep 7. Epub 2021 Sep 7.

Department of Radiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, No. 107 Yanjiang Road West, Guangzhou, 510120, China.

Objectives: To investigate whether quantitative DCE-MRI (qDCE-MRI) could help distinguish breast phyllodes tumor (PT) grades.

Materials And Methods: This retrospective study included 67 breast PTs (26 benign lesions, 25 borderline lesions, and 16 malignant lesions) from April 2016 to July 2020. MRI was performed with a 1.5-T MR system. Perfusion parameters (K, k, v, iAUC60) derived from qDCE-MRI, tumor size, and the mean ADC value were correlated with histologic grades using Spearman's rank correlation coefficient. K, k, v, and iAUC60 of three histologic grades were also calculated and compared.

Results: The Spearman correlation coefficient with histologic grade of the tumor size was 0.578 (p < 0.001); the ADC value was not correlated with histologic grades of breast PT (p = 0.059). The K, k, v, and iAUC60 of benign breast PTs were significantly lower than those of borderline breast PTs (p < 0.001) and lower than those of malignant breast PTs (p < 0.001). In comparison, the K, v, and iAUC60 of borderline breast PTs were significantly lower than those of malignant breast PTs (p < 0.001, p < 0.001, p = 0.007, respectively). For ROC analysis, AUCs of K, v, and iAUC60 were higher than tumor size and ADC value for differentiating three PT grades.

Conclusion: Quantitative and semi-quantitative perfusion parameters (K, v, and iAUC60, especially K) derived from qDCE-MRI showed better diagnosis efficiency than tumor size and ADC for grading breast PTs. Therefore, qDCE-MRI may be helpful for preoperative differentiating breast PT grades.

Key Points: • Quantitative dynamic contrast-enhanced MRI can be used as a complementary noninvasive method to improve the differential diagnosis of breast PT. • K, v, and iAUC60 derived from qDCE-MRI showed better diagnosis efficiency than tumor size and ADC for grading breast PTs.
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http://dx.doi.org/10.1007/s00330-021-08232-xDOI Listing
September 2021

Palladium-Catalyzed Intramolecular Cross-Coupling of Unactivated C(sp)-H and C(sp)-H Bonds.

Org Lett 2021 Sep 3. Epub 2021 Sep 3.

School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai 200092, China.

Direct C-H/C-H coupling represents an appealing method for the construction of C-C bonds, and the cross-coupling of unactivated C(sp)-H and C(sp)-H bonds is challenging and remains to be investigated. We have developed the Pd-catalyzed intramolecular coupling of inert C(sp)-H and C(sp)-H bonds. The reaction proceeded by -methyl oxime-directed aryl C(sp)-H activation and subsequent alkyl C(sp)-H cleavage, generating C(sp),C(sp)-palladacycles as the key intermediates. Dihydrobenzofurans and indanes were formed as the final products.
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http://dx.doi.org/10.1021/acs.orglett.1c02567DOI Listing
September 2021

Exploratory analysis of the associations between urinary phytoestrogens and thyroid hormones among adolescents and adults in the United States: National Health and Nutrition Examination Survey 2007-2010.

Environ Sci Pollut Res Int 2021 Aug 12. Epub 2021 Aug 12.

State Key Laboratory of Reproductive Medicine, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, 211166, China.

Phytoestrogens are naturally plant-derived compounds that could bind to estrogen receptors and mimic estrogenic effects. Previous studies showed a positive association between phytoestrogens and hypothyroidism; however, little is known on phytoestrogens and thyroid hormones. This study was designed to investigate the associations between urinary phytoestrogens and thyroid hormone levels. Based on the US National Health and Nutrition Examination Survey (NHANES) 2007-2010, 4103 participants were recruited in this cross-sectional study. Linear regression models and multiple linear regressions models were applied to examine the relationships between urinary phytoestrogens and thyroid hormone levels. Urinary O-desmethylangolensin (O-DMA) was found to be correlated with serum FT levels in the female 20-60-year-of-age group (β=0.018, 95% CI: 0.006, 0.031). Higher enterolactone (ENT) levels were significantly positively associated with TSH levels in the 12-19-year-of-age female group (β=0.196, 95% CI: 0.081, 0.311). In the male group, enterodiol (END) was significantly positively correlated with TSH and TT in the 12-19-year-of-age group, respectively (TT: β=3.444, 95% CI: 0.150, 6.737; TSH: β=0.104, 95% CI: 0.005, 0.203). However, equol (EQU) levels were negatively associated with TT (12-19-year-of-age: β=- 0.166, 95% CI: - 0.279, - 0.034; 20-60-year-of-age: β=- 0.132, 95% CI: - 0.230, - 0.034). Our study provided epidemiological evidence that urinary phytoestrogens were powerfully associated with thyroid hormone levels. The results also supported that phytoestrogens acted as endocrine disruptors. It is imperative and important to pay attention to the intake of phytoestrogens.
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http://dx.doi.org/10.1007/s11356-021-14553-7DOI Listing
August 2021

Localization of subcentimeter pulmonary nodules using an indocyanine green near-infrared imaging system during uniportal video-assisted thoracoscopic surgery.

J Cardiothorac Surg 2021 Aug 6;16(1):224. Epub 2021 Aug 6.

Department of Thoracic Surgery, The Fourth Affiliated Hospital of China Medical University, No.4, Chongshan East road, Shenyang, China.

Background: To investigate the feasibility of indocyanine green (ICG) use in localizing subcentimeter pulmonary nodules during uniportal video-assisted thoracoscopic surgery.

Methods: This study was a retrospective analysis of 32 patients who underwent surgery due to pulmonary nodules using ICG localization from September 2019 to March 2020 in the Department of Thoracic Surgery, The Fourth Affiliated Hospital of China Medical University. Laser positioning and large-aperture spiral CT simulation were performed preoperatively. ICG was injected into the lung (2.5 mg/ml). The clinical characteristics and postoperative indicators were recorded.

Results: A total of 33 subcentimeter pulmonary nodules were successfully localized in 32 patients. Twenty-three patients underwent lobectomy, with an average surgical time of 45.3 min and an average tube retention time of 2 days. Non-small cell lung cancer was confirmed intraoperatively in 9 patients, among whom the longest surgical time was 120 min, and the shortest hospital stay was 7 days. No patient was converted to thoracotomy or developed serious complications.

Conclusions: ICG imaging is a safe and effective technique for localization of pulmonary nodules. Due to the widespread application of near-infrared devices, fluorescent localization and imaging technology will be more widely used in thoracic surgery.
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http://dx.doi.org/10.1186/s13019-021-01603-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8348821PMC
August 2021

The feasibility and advantages of immediate removal of urinary catheter after lobectomy: A prospective randomized trial.

Nurs Open 2021 Jul 30. Epub 2021 Jul 30.

Department of Thoracic Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, China.

Aim: This study aims to evaluate the feasibility and advantages of immediate urinary catheter removal compared with prolonged indwelling catheterization in lung cancer lobectomy.

Design: This study was designed as a prospective, single-centre, randomized and open-label clinical study.

Methods: People with lung cancer undergoing lobectomy/pneumonectomy were recruited and randomly allocated to two groups. One group had their urinary catheter removed immediately while the other group had it removed 48 hr after surgery.

Results: No significant difference in the incidence of postoperative urinary retention (POUR) was observed between the two groups. However, the incidence of postoperative catheter-associated urinary tract infection (CAUTI) in the immediate removal group (6.7%) was lower than the control group (17.2%) (p = .030). Furthermore, the incidence of catheter-associated emergence agitation (CAEA) in the control group (25.3%) was higher than the immediate removal group (8.9%) (p = .007). The average length of hospital stay of the immediate removal group [6.51(4-11) days] was shorter than the control group [7.20(5-12) days] (p = .002). Immediate removal of urinary catheter appeared to have fewer complications and shorter hospital stay than delayed removal.
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http://dx.doi.org/10.1002/nop2.1006DOI Listing
July 2021

Magnetic resonance imaging radiomics predicts preoperative axillary lymph node metastasis to support surgical decisions and is associated with tumor microenvironment in invasive breast cancer: A machine learning, multicenter study.

EBioMedicine 2021 Jul 4;69:103460. Epub 2021 Jul 4.

Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Department of Medical Oncology, Breast Tumor Centre, Phase I Clinical Trial Centre, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China. Electronic address:

Background: in current clinical practice, the standard evaluation for axillary lymph node (ALN) status in breast cancer has a low efficiency and is based on an invasive procedure that causes operative-associated complications in many patients. Therefore, we aimed to use machine learning techniques to develop an efficient preoperative magnetic resonance imaging (MRI) radiomics evaluation approach of ALN status and explore the association between radiomics and the tumor microenvironment in patients with early-stage invasive breast cancer.

Methods: in this retrospective multicenter study, three independent cohorts of patients with breast cancer (n = 1,088) were used to develop and validate signatures predictive of ALN status. After applying the machine learning random forest algorithm to select the key preoperative MRI radiomic features, we used ALN and tumor radiomic features to develop the ALN-tumor radiomic signature for ALN status prediction by the support vector machine algorithm in 803 patients with breast cancer from Sun Yat-sen Memorial Hospital and Sun Yat-sen University Cancer Center (training cohort). By combining ALN and tumor radiomic features with corresponding clinicopathologic information, the multiomic signature was constructed in the training cohort. Next, the external validation cohort (n = 179) of patients from Shunde Hospital of Southern Medical University and Tungwah Hospital of Sun Yat-Sen University, and the prospective-retrospective validation cohort (n = 106) of patients treated with neoadjuvant chemotherapy in prospective phase 3 trials [NCT01503905], were included to evaluate the predictive value of the two signatures, and their predictive performance was assessed by the area under operating characteristic curve (AUC). This study was registered with ClinicalTrials.gov, number NCT04003558.

Findings: the ALN-tumor radiomic signature for ALN status prediction comprising ALN and tumor radiomic features showed a high prediction quality with AUC of 0·88 in the training cohort, 0·87 in the external validation cohort, and 0·87 in the prospective-retrospective validation cohort. The multiomic signature incorporating tumor and lymph node MRI radiomics, clinical and pathologic characteristics, and molecular subtypes achieved better performance for ALN status prediction with AUCs of 0·90, 0·91, and 0·93 in the training cohort, the external validation cohort, and the prospective-retrospective validation cohort, respectively. Among patients who underwent neoadjuvant chemotherapy in the prospective-retrospective validation cohort, there were significant differences in the key radiomic features before and after neoadjuvant chemotherapy, especially in the gray-level dependence matrix features. Furthermore, there was an association between MRI radiomics and tumor microenvironment features including immune cells, long non-coding RNAs, and types of methylated sites. Interpretation this study presented a multiomic signature that could be preoperatively and conveniently used for identifying patients with ALN metastasis in early-stage invasive breast cancer. The multiomic signature exhibited powerful predictive ability and showed the prospect of extended application to tailor surgical management. Besides, significant changes in key radiomic features after neoadjuvant chemotherapy may be explained by changes in the tumor microenvironment, and the association between MRI radiomic features and tumor microenvironment features may reveal the potential biological underpinning of MRI radiomics.

Funding: No funding.
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http://dx.doi.org/10.1016/j.ebiom.2021.103460DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8261009PMC
July 2021

Pd-catalyzed cross-electrophile Coupling/C-H alkylation reaction enabled by a mediator generated C(sp)-H activation.

Chem Sci 2021 May 19;12(24):8531-8536. Epub 2021 May 19.

School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University 1239 Siping Road Shanghai 200092 China

Transition-metal-catalyzed cross-electrophile C(sp)-(sp) coupling and C-H alkylation reactions represent two efficient methods for the incorporation of an alkyl group into aromatic rings. Herein, we report a Pd-catalyzed cascade cross-electrophile coupling and C-H alkylation reaction of 2-iodo-alkoxylarenes with alkyl chlorides. Methoxy and benzyloxy groups, which are ubiquitous functional groups and common protecting groups, were utilized as crucial mediators primary or secondary C(sp)-H activation. The reaction provides an innovative and convenient access for the synthesis of alkylated phenol derivatives, which are widely found in bioactive compounds and organic functional materials.
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http://dx.doi.org/10.1039/d1sc01731dDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8221197PMC
May 2021

A multicenter study to develop a non-invasive radiomic model to identify urinary infection stone in vivo using machine-learning.

Kidney Int 2021 Jun 12. Epub 2021 Jun 12.

Department of Pharmacy, the First People's Hospital of Kashi Prefecture, Affiliated Kashi Hospital of Sun Yat-Sen University, Kashi, People's Republic of China. Electronic address:

Urolithiasis is a common urological disease, and treatment strategy options vary between different stone types. However, accurate detection of stone composition can only be performed in vitro. The management of infection stones is particularly challenging with yet no effective approach to pre-operatively identify infection stones from non-infection stones. Therefore, we aimed to develop a radiomic model for preoperatively identifying infection stones with multicenter validation. In total, 1198 eligible patients with urolithiasis from three centers were divided into a training set, an internal validation set, and two external validation sets. Stone composition was determined by Fourier transform infrared spectroscopy. A total of 1316 radiomic features were extracted from the pre-treatment Computer Tomography images of each patient. Using the least absolute shrinkage and selection operator algorithm, we identified a radiomic signature that achieved favorable discrimination in the training set, which was confirmed in the validation sets. Moreover, we then developed a radiomic model incorporating the radiomic signature, urease-producing bacteria in urine, and urine pH based on multivariate logistic regression analysis. The nomogram showed favorable calibration and discrimination in the training and three validation sets (area under the curve [95% confidence interval], 0.898 [0.840-0.956], 0.832 [0.742-0.923], 0.825 [0.783-0.866], and 0.812 [0.710-0.914], respectively). Decision curve analysis demonstrated the clinical utility of the radiomic model. Thus, our proposed radiomic model can serve as a non-invasive tool to identify urinary infection stones in vivo, which may optimize disease management in urolithiasis and improve patient prognosis.
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http://dx.doi.org/10.1016/j.kint.2021.05.031DOI Listing
June 2021

Pd-Catalyzed ,-Dimethylation of -Substituted Iodoarenes via a Base-Controlled C-H Activation Cascade with Dimethyl Carbonate as the Methyl Source.

J Am Chem Soc 2021 03 22;143(12):4524-4530. Epub 2021 Mar 22.

School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai 200092, China.

A methyl group can have a profound impact on the pharmacological properties of organic molecules. Hence, developing methylation methods and methylating reagents is essential in medicinal chemistry. We report a palladium-catalyzed dimethylation reaction of -substituted iodoarenes using dimethyl carbonate as a methyl source. In the presence of KCO as a base, iodoarenes are dimethylated at the - and -positions of the iodo group, which represents a novel strategy for -C-H methylation. With KOAc as the base, subsequent oxidative C(sp)-H/C(sp)-H coupling occurs; in this case, the overall transformation achieves triple C-H activation to form three new C-C bonds. These reactions allow expedient access to 2,6-dimethylated phenols, 2,3-dihydrobenzofurans, and indanes, which are ubiquitous structural motifs and essential synthetic intermediates of biologically and pharmacologically active compounds.
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http://dx.doi.org/10.1021/jacs.0c13057DOI Listing
March 2021

Imaging and clinical features of colorectal liver metastases with macroscopic intrabiliary growth.

Eur J Radiol 2021 Apr 25;137:109616. Epub 2021 Feb 25.

Department of Radiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, China; Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Medical Research Center, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, China. Electronic address:

Purpose: The purpose of this study was to evaluate imaging and clinical features of colorectal liver metastases complicated with macroscopic intrabiliary growth, and correlate the unusual pattern of spread with treatment and follow-up.

Methods: A retrospective analysis of the clinical, imaging and follow-up files of all patients with surgically resected colorectal liver metastases from January 2016 to October 2020 was reviewed to identify those with macroscopic intrabiliary growth. Two radiologists evaluated the radiological features of colorectal liver metastasis with macroscopic intrabiliary growth. The histopathological findings and follow-up results were also investigated.

Results: A total of 555 patients were included. Colorectal liver metastasis with macroscopic intrabiliary growth was present in 5 patients (0.9 %). Four patients experienced tumor recurrence or progression after surgical treatment (80 %), and recurrent tumors retained propensity for intraductal growth. CT (n = 6) and MR (n = 6) examinations were performed before 8 operations with the pathological examination confirmed macroscopic intrabiliary colorectal metastases. According to the location, intrabiliary colorectal metastases were classified into two categories: peripheral (n = 3) and central involvement (n = 5). The lengths of tumoral extension into the downstream bile duct were more than those of extension into the upstream bile duct (P = 0.029). On CT images, all cases showed dilated bile ducts filled with soft tissue attenuation presenting moderate (n = 4) or obvious (n = 2) enhancement. On MR images, all intra-hepatic and intrabiliary components of the metastases showed restricted diffusion on diffusion-weighted imaging, and peritumoral wedge-shaped T1-weighted hyperintensity appeared in the cases with obstruction of intrahepatic bile ducts.

Conclusions: The propensity for colorectal liver metastasis with intrabiliary growth to grow longitudinally and extend beyond the intrahepatic tumor edge elevates the risk of high recurrence after operation. Intrabiliary growth of liver metastasis exhibits characteristic MR and CT imaging features, which help to make an accurate diagnosis and improve treatment plans.
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http://dx.doi.org/10.1016/j.ejrad.2021.109616DOI Listing
April 2021

Diastereoselective Construction of Eight-Membered Carbocycles through Palladium-Catalyzed C(sp)-H Functionalization.

Org Lett 2021 Feb 9;23(4):1269-1274. Epub 2021 Feb 9.

School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai, 200092, P. R. China.

A palladium-catalyzed cross-coupling reaction of 2-alkylphenyl bromides with biphenylene has been developed. The reactions formed eight-membered carbocycles through C(sp)-H activation and the formation of two C-C bonds, and the chiral products were obtained with excellent diastereoselectivity. The reaction provides a new strategy for the construction of eight-membered carbocycles, and the products represent a novel type of chiral scaffold.
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http://dx.doi.org/10.1021/acs.orglett.0c04244DOI Listing
February 2021

Development and Validation of a Preoperative Magnetic Resonance Imaging Radiomics-Based Signature to Predict Axillary Lymph Node Metastasis and Disease-Free Survival in Patients With Early-Stage Breast Cancer.

JAMA Netw Open 2020 12 1;3(12):e2028086. Epub 2020 Dec 1.

Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Breast Tumor Centre, Department of Medical Oncology, Phase I Clinical Trial Centre, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.

Importance: Axillary lymph node metastasis (ALNM) status, typically estimated using an invasive procedure with a high false-negative rate, strongly affects the prognosis of recurrence in breast cancer. However, preoperative noninvasive tools to accurately predict ALNM status and disease-free survival (DFS) are lacking.

Objective: To develop and validate dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) radiomic signatures for preoperative identification of ALNM and to assess individual DFS in patients with early-stage breast cancer.

Design, Setting, And Participants: This retrospective prognostic study included patients with histologically confirmed early-stage breast cancer diagnosed at 4 hospitals in China from July 3, 2007, to September 21, 2019, randomly divided (7:3) into development and vaidation cohorts. All patients underwent preoperative MRI scans, were treated with surgery and sentinel lymph node biopsy or ALN dissection, and were pathologically examined to determine the ALNM status. Data analysis was conducted from February 15, 2019, to March 20, 2020.

Exposure: Clinical and DCE-MRI radiomic signatures.

Main Outcomes And Measures: The primary end points were ALNM and DFS.

Results: This study included 1214 women (median [IQR] age, 47 [42-55] years), split into development (849 [69.9%]) and validation (365 [30.1%]) cohorts. The radiomic signature identified ALNM in the development and validation cohorts with areas under the curve (AUCs) of 0.88 and 0.85, respectively, and the clinical-radiomic nomogram accurately predicted ALNM in the development and validation cohorts (AUC, 0.92 and 0.90, respectively) based on a least absolute shrinkage and selection operator (LASSO)-logistic regression model. The radiomic signature predicted 3-year DFS in the development and validation cohorts (AUC, 0.81 and 0.73, respectively), and the clinical-radiomic nomogram could discriminate high-risk from low-risk patients in the development cohort (hazard ratio [HR], 0.04; 95% CI, 0.01-0.11; P < .001) and the validation cohort (HR, 0.04; 95% CI, 0.004-0.32; P < .001) based on a random forest-Cox regression model. The clinical-radiomic nomogram was associated with 3-year DFS in the development and validation cohorts (AUC, 0.89 and 0.90, respectively). The decision curve analysis demonstrated that the clinical-radiomic nomogram displayed better clinical predictive usefulness than the clinical or radiomic signature alone.

Conclusions And Relevance: This study described the application of MRI-based machine learning in patients with breast cancer, presenting novel individualized clinical decision nomograms that could be used to predict ALNM status and DFS. The clinical-radiomic nomograms were useful in clinical decision-making associated with personalized selection of surgical interventions and therapeutic regimens for patients with early-stage breast cancer.
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http://dx.doi.org/10.1001/jamanetworkopen.2020.28086DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7724560PMC
December 2020

Higher urinary nitrate was associated with lower prevalence of congestive heart failure: results from NHANES.

BMC Cardiovasc Disord 2020 11 25;20(1):498. Epub 2020 Nov 25.

The First Affiliated Hospital of Nanjing Medical University, Jiangsu Province Hospital, Nanjing, 210029, Jiangsu, China.

Background: Some studies have reported that nitrate intake from vegetables was inversely associated with many vascular diseases, but few studies have paid attention to the relationship between urinary nitrate and cardiovascular diseases (CVDs). This cross-sectional study aimed to explore the connections between urinary nitrate and prevalence of CVDs.

Methods: The data of this study was collected from National Health and Nutrition Examination Survey (NHANES). Finally, several years' data of NHANES were merged into 14,894 observations. Logistic regression models were used to examine the associations between urinary nitrate and CVDs by using the "survey" package in R software (version 3.2.3).

Results: In the univariable logistic analysis, significant association was discovered between urinary nitrate and congestive heart failure, coronary heart disease, angina pectoris, myocardial infarction (all P < 0.001). By adjusting related covariates, the multivariable logistic analysis showed that the significant association only existed between urinary nitrate and congestive heart failure (OR = 0.651, 95% CI 0.507-0.838, P < 0.001). Compared to Q1 urinary nitrate level as reference, the risk for prevalent heart failure diminished along with increasing levels of urinary nitrates, (OR of Q2 level = 0.633, 95% CI 0.403-0.994), (OR of Q3 level = 0.425, 95% CI 0.230-0.783), (OR of Q4 level = 0.375, 95% CI 0.210-0.661), respectively. Moreover, urinary nitrate levels were associated with congestive heart failure in a dose-dependent manner in both 20-60 years group, 60+ years group and male, female group (P < 0.001, P = 0.011 and P = 0.009, P = 0.004).

Conclusions: Independent of related covariates, higher urinary nitrate was associated with lower prevalent congestive heart failure.
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http://dx.doi.org/10.1186/s12872-020-01790-wDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7690024PMC
November 2020

Breast fibromatosis: Imaging and clinical findings.

Breast J 2020 11 4;26(11):2217-2222. Epub 2020 Aug 4.

Department of Radiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.

Breast fibromatosis is a rare histologically benign tumor with local aggressive potential, and imaging and clinical findings of breast fibromatosis require attention. We retrospectively evaluated the images of 20 patients with histologically proven breast fibromatosis on mammography, magnetic resonance imaging (MRI), and ultrasonography. The lesions were assessed concerning the location, fascia involvement, imaging characteristics, and follow-up outcomes. Altogether, there were 22 lesions: 10 lesions involved the superficial fascia system including four lesions additionally involving the deep fascia and pectoralis major, and 12 lesions were inside the glandular parenchyma with two lesions originated from the prior surgery site. The detection rates of mammography, ultrasound, and MRI for breast fibromatosis were 33.3% (3/9), 90% (18/20), and 100% (3/3), respectively. We found that fascia involvement may be a characteristic of breast fibromatosis. The lesion located inside glandular parenchyma is prone to be underestimated, whereas combined MR with ultrasound is recommended for the diagnosis. The complete excision with negative margins is important for a good prognosis.
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http://dx.doi.org/10.1111/tbj.14008DOI Listing
November 2020

Design, synthesis and biological evaluation of novel fluoro-substituted benzimidazole derivatives with anti-hypertension activities.

Bioorg Chem 2020 08 26;101:104042. Epub 2020 Jun 26.

Department of Pharmaceutical Science and Technology, College of Chemistry and Biology, Donghua University, Shanghai 201620, China. Electronic address:

A series of new fluoro-substituted benzimidazole derivatives were designed, synthesized and pharmacologically evaluated. All the target compounds were characterized by HNMR, CNMR, mass spectra and elemental analysis. The biological evaluation showed that most of the synthesized compounds displayed nanomolar affinity to the angiotensin II type 1 (AT) receptor and could decrease blood pressure efficiently in spontaneously hypertensive rats. The maximal response of mean blood pressure (MBP) lowered 74.5 ± 3.5 mmHg (1g) and 69.2 ± 0.9 mmHg (2a) at 10 g/kg after oral administration, and the antihypertensive effect lasted beyond 24 h, which performed better than both losartan and telmisartan. So, compounds 1g and 2a may be considered as potential antihypertension drug candidates.
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http://dx.doi.org/10.1016/j.bioorg.2020.104042DOI Listing
August 2020

Assessing differences in the response of forest aboveground biomass and composition under climate change in subtropical forest transition zone.

Sci Total Environ 2020 Mar 25;706:135746. Epub 2019 Nov 25.

School of Geographical Sciences, Guangzhou University, No. 230 Wai Huan Xi Road, Guangzhou Higher Education Mega Center, Guangzhou 510006, People's Republic of China.

The subtropical forest transition zone in southern China is a typical transition zone with high coverage and diverse vegetation. Projected climate change will affect physiological processes of trees, which would consequently alter the forest aboveground biomass (AGB) and composition at broad spatial scales. However, spatially heterogeneous responses may also be shaped by climate change, succession, and harvesting in different forest habitats. The objectives of this study were to assess the changes in subtropical forest AGB and composition in response to climate change, while comparing the responses of two similar forest landscapes: Taihe County (TH) and Longnan County (LN). We used a loose-coupling of PnET-II with LANDIS-II to simulate changes in forest AGB and composition under climate change scenarios (Current climate, RCP2.6, RCP4.5, RCP6.0, and RCP8.5) with harvest disturbances. Our simulation results demonstrated that forest AGB and composition were significantly affected by climate change in both landscapes. Changes in forest AGB was mostly driven by succession and harvest, but climate change also greatly contribute to the variation in AGB of deciduous broad-leaved forests (DBF), and coniferous forests (CF). Moreover, a larger area of LN experienced biomass reduction compared to TH, specifically under the RCP8.5 scenario. Given our estimates of the response in forest AGB and composition under climate change scenarios across different periods, we recommend that the regional forest management should be localized and should consider the effects of climate change through time in their planning schemes.
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http://dx.doi.org/10.1016/j.scitotenv.2019.135746DOI Listing
March 2020

Development of a noninvasive tool to preoperatively evaluate the muscular invasiveness of bladder cancer using a radiomics approach.

Cancer 2019 12 30;125(24):4388-4398. Epub 2019 Aug 30.

Department of Urology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, People's Republic of China.

Background: Bladder cancer (BCa) can be divided into muscle-invasive BCa (MIBC) and non-muscle-invasive BCa (NMIBC). Whether the tumor infiltrates the detrusor muscle is a critical determinant of disease management in patients with BCa. However, the current preoperative diagnostic accuracy of muscular invasiveness is less than satisfactory. The authors report a radiomic-clinical nomogram for the individualized preoperative differentiation of MIBC from NMIBC.

Methods: In total, 2602 radiomics features were extracted from whole bladder tumors and the basal part of the lesions on T2-weighted magnetic resonance imaging. Then, a radiomics signature was constructed using the least absolute shrinkage and selection operator algorithm in the training set (n = 130). Furthermore, a radiomic-clinical nomogram was developed incorporating the radiomics signature and selected clinical predictors based on a multivariable logistic regression analysis. The performance of the nomogram (discrimination, calibration, and clinical usefulness) was assessed and validated in an independent validation set (n = 69).

Results: The radiomics signature, consisting of 23 selected features, showed good discrimination in the training and validation sets (area under the curve [AUC], 0.913 and 0.874, respectively). Incorporating the radiomics signature and magnetic resonance imaging-determined tumor size, the radiomic-clinical nomogram showed favorable calibration and discrimination in the training set with an AUC of 0.922, which was confirmed in the validation set (AUC, 0.876). Decision curve analysis and net reclassification improvement and integrated discrimination improvement indices (net reclassification improvement, 0.338, integrated discrimination improvement, 0.385) demonstrated the clinical usefulness of the nomogram.

Conclusions: The proposed noninvasive radiomic-clinical nomogram can increase the accuracy of preoperatively discriminating MIBC from NMIBC, which may aid in clinical decision making and improve patient prognosis.
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http://dx.doi.org/10.1002/cncr.32490DOI Listing
December 2019

Synthesis of Indolines by Palladium-Catalyzed Intermolecular Amination of Unactivated C(sp)-H Bonds.

Org Lett 2019 08 5;21(16):6508-6512. Epub 2019 Aug 5.

School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability , Tongji University , 1239 Siping Road , Shanghai , 200092 , P. R. China.

A new palladium-catalyzed C(sp)-H amination reaction has been developed. 1-(-Butyl)-2-iodobenzene and its derivatives undergo palladium-catalyzed C-H activation to form palladacycles. The palladacycles are aminated with diaziridinone to form indolines as the final products. The reaction represents a new method for the synthesis of 3,3-disubstituted indolines, which are essential structural motifs in many bioactive compounds and pharmaceutical targets.
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http://dx.doi.org/10.1021/acs.orglett.9b02386DOI Listing
August 2019

Design, synthesis and biological evaluation of AT receptor blockers derived from 6-substituted aminocarbonyl benzimidazoles.

Eur J Med Chem 2019 Nov 24;181:111553. Epub 2019 Jul 24.

Department of Pharmaceutical Science and Technology, College of Chemistry and Biology, Donghua University, Shanghai, 201620, China. Electronic address:

A series of new 6-substituted aminocarbonyl benzimidazole derivatives with 1, 4-disubsituted or 1, 5-disubsituted indole moiety and benzoic acid moiety were designed, synthesized and pharmacologically evaluated. Most of the synthesized compounds could bind to the AT receptor and decrease blood pressure significantly. Notably, 2e and 1h could obviously decrease MBP in a dose dependent manner. The maximal response lowered 57.9 ± 2.3 mmHg (2e) and 57.6 ± 1.9 mmHg (1h) of MBP at 10 mg/kg after oral administration, and the antihypertensive effect lasted beyond 24 h, which performed better than Losartan (Fig. 1). These results indicate that 2e and 1h are effective and long-lasting anti-hypertension drug candidates and deserve further investigation for therapeutic application.
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http://dx.doi.org/10.1016/j.ejmech.2019.07.056DOI Listing
November 2019

Enzyme and Transporter Kinetics for CPT-11 (Irinotecan) and SN-38: An Insight on Tumor Tissue Compartment Pharmacokinetics Using PBPK.

Recent Pat Anticancer Drug Discov 2019 ;14(2):177-186

Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, NY 11439, United States.

Background: Computational tools are becoming more and more powerful and comprehensive as compared to past decades in facilitating pharmaceutical, pharmacological and clinical practice. Anticancer agents are used either as monotherapy or in combination therapy to treat malignant conditions of the body. A single antineoplastic agent may be used in different types of malignancies at different doses according to the stage of the disease.

Objective: To study the behavior of CPT-11 (Irinotecan) and its metabolite SN-38 in tumor tissue compartment through the Whole Body-Physiologically Pharmacokinetics (WB-PBPK) and to determine the activity of metabolic enzymes and transporters participating in the disposition of CPT-11 and SN-38 working in their physiological environment inside the human body.

Methods: Whole body PBPK approach is used to determine the activity of different metabolic enzymes and transporters involved in the disposition of CPT-11 and its active metabolite, SN-38. The concentrations and pharmacokinetic parameters of the parent compound and its metabolite administered at clinically applicable dose via the intravenous route in the tumor tissue are predicted using this approach.

Results: The activity rate constants of metabolic enzymes and transporters of CPT-11 are derived at their natural anatomic locations. Concentration-time curves of CPT-11 and SN-38 with their 5th to 95th percentage range are achieved at the tumor tissue level. Mean tumor tissue pharmacokinetics of both compounds are determined in a population of 100 individuals.

Conclusion: Tumor tissue concentration-time curves of CPT-11 and SN-38 can be determined via PBPK modeling. Rate constants of enzymes and transporters can be shown for healthy and tumor bearing individuals. The results will throw light on the effective concentration of active compound at its target tissue at the clinically applied IV dose.
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http://dx.doi.org/10.2174/1574892814666190212164356DOI Listing
February 2020

Design, Synthesis, and Biological Evaluation of 6-Benzoxazole Benzimidazole Derivatives with Antihypertension Activities.

ACS Med Chem Lett 2019 Jan 31;10(1):40-43. Epub 2018 Dec 31.

Department of Pharmaceutical Science and Technology, College of Chemistry and Biology, Donghua University, Shanghai 201620, China.

A series of new angiotensin II receptor 1 antagonists were prepared. They displayed nanomolar affinity to AT receptor and could decrease blood pressure efficiently in spontaneously hypertensive rats. Among them, compounds and could reduce the blood pressure with more or equal potency compared to Losartan. So, compounds and could be considered as potential antihypertension drug candidates.
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http://dx.doi.org/10.1021/acsmedchemlett.8b00335DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6331155PMC
January 2019

Synthesis of Indoles through Palladium-Catalyzed Three-Component Reaction of Aryl Iodides, Alkynes, and Diaziridinone.

Org Lett 2018 10 10;20(20):6440-6443. Epub 2018 Oct 10.

School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability , Tongji University , 1239 Siping Road , Shanghai , 200092 , P. R. China.

The three-component reaction of aryl iodides, alkynes, and diaziridinone is described. The reaction provides an innovative synthetic approach for indoles. The approach features high efficiency, broad substrate scope, and excellent regioselectivity. C, C-Palladacycles should act as the intermediates. The C, C-palladacycles are obtained from simple aryl halides and alkynes and then reacted with diaziridinone to afford indoles.
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http://dx.doi.org/10.1021/acs.orglett.8b02750DOI Listing
October 2018

FKBP1A rs6041749 polymorphism is associated with allograft function in renal transplant patients.

Eur J Clin Pharmacol 2019 Jan 13;75(1):33-40. Epub 2018 Sep 13.

Department of Pharmacy, Huashan Hospital, Fudan University, 12 Middle Urumqi Road, Shanghai, China.

Aim: To investigate the potential impact of single-nucleotide polymorphisms (SNPs) in the FK506-binding protein (FKBP)-calcineurin (CaN)-nuclear factor of activated T cells (NFAT) signaling pathway on the efficacy and safety of tacrolimus (TAC) in Chinese renal transplant patients.

Methods: Seventy-seven tag SNPs were detected in 146 patients who were on TAC-based maintenance immunosuppression and who followed up for at least 2 years. The relationships of these polymorphisms with clinical outcomes such as acute rejection, acute nephrotoxicity, pneumonia, and estimated glomerular filtration rate (eGFR) were explored. For the FKBP1A rs6041749 polymorphism, which has a significant association with renal function over time, a preliminary functional analysis was performed using a dual-luciferase reporter gene system.

Results: The patients with FKBP1A rs6041749 TT genotype had a more stable eGFR level than CC and CT carriers (P = 2.08 × 10) during the 2 years following transplantation. Dual-luciferase reporter assay results showed that the rs6041749 C variant could enhance the relative luciferase activity compared with the T variant, which indicated that the rs6041749 C allele may increase the FKBP1A gene transcription. In addition, we did not find any association between these genetic variants and the risk of acute rejection, acute nephrotoxicity, and pneumonia in renal transplant patients receiving TAC-based immunosuppression.

Conclusions: FKBP1A rs6041749 C allele carriers are at higher risk for eGFR deterioration. The variant might serve as a biomarker to predict allograft function in renal transplant patients.
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http://dx.doi.org/10.1007/s00228-018-2546-xDOI Listing
January 2019

The expression and correlation between chemokine CCL7 and ABCE1 in non-small cell lung cancer.

Exp Ther Med 2018 Oct 2;16(4):3004-3010. Epub 2018 Aug 2.

Department of Thoracic Surgery, The Fourth Affiliated Hospital of China Medical University, Shenyang, Liaoning 110032, P.R. China.

Lung cancer is a malignant disease, and has the highest incidence and mortality worldwide. Lung cancer is also a popular subject in the field of cancer research. The molecular mechanisms of lung cancer development, invasion and metastasis need to be determined to prolong survival times and improve the quality of life. Recent studies have demonstrated that ATP-binding cassette sub-family E member 1 (ABCE1) is one of the factors that contributes to the development and metastasis of lung cancer, but the specific mechanism of this phenomenon remains unclear. A polymerase chain reaction microarray was used in the present study to screen for chemokine (C-C motif) ligand 7 (CCL7) expression in cell lines that highly expressed ABCE1, and the results showed that CCL7 was highly expressed in H1299 cells (P<0.01). The expression of CCL7 and ABCE1 in lung cancer tissues obtained from 30 patients with non-small cell lung cancer (NSCLC) was higher than that in adjacent normal lung tissues (P<0.01), and a positive correlation between the expression levels of the two genes in NSCLC was observed. These findings indicate that ABCE1 is involved in the development and progression of lung cancer through the CCL7 signaling pathway.
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http://dx.doi.org/10.3892/etm.2018.6568DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6125957PMC
October 2018

Development and Validation of an MRI-Based Radiomics Signature for the Preoperative Prediction of Lymph Node Metastasis in Bladder Cancer.

EBioMedicine 2018 Aug 2;34:76-84. Epub 2018 Aug 2.

Department of Urology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Guangzhou, PR China; State Key Laboratory of Oncology in South China, PR China. Electronic address:

Background: Preoperative lymph node (LN) status is important for the treatment of bladder cancer (BCa). However, a proportion of patients are at high risk for inaccurate clinical nodal staging by current methods. Here, we report an accurate magnetic resonance imaging (MRI)-based radiomics signature for the individual preoperative prediction of LN metastasis in BCa.

Methods: In total, 103 eligible BCa patients were divided into a training set (n = 69) and a validation set (n = 34). And 718 radiomics features were extracted from the cancerous volumes of interest (VOIs) on T2-weighted MRI images. A radiomics signature was constructed using the least absolute shrinkage and selection operator (LASSO) algorithm in the training set, whose performance was assessed and then validated in the validation set. Stratified analyses were also performed. Based on the multivariable logistic regression analysis, a radiomics nomogram was developed incorporating the radiomics signature and selected clinical predictors. Discrimination, calibration and clinical usefulness of the nomogram were assessed.

Findings: Consisting of 9 selected features, the radiomics signature showed a favorable discriminatory ability in the training set with an AUC of 0.9005, which was confirmed in the validation set with an AUC of 0.8447. Encouragingly, the radiomics signature also showed good discrimination in the MRI-reported LN negative (cN0) subgroup (AUC, 0.8406). The nomogram, consisting of the radiomics signature and the MRI-reported LN status, showed good calibration and discrimination in the training and validation sets (AUC, 0.9118 and 0.8902, respectively). The decision curve analysis indicated that the nomogram was clinically useful.

Interpretation: The MRI-based radiomics nomogram has the potential to be used as a non-invasive tool for individualized preoperative prediction of LN metastasis in BCa. External validation is further required prior to clinical implementation.
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http://dx.doi.org/10.1016/j.ebiom.2018.07.029DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6116473PMC
August 2018

Site-Mutation of Hydrophobic Core Residues Synchronically Poise Super Interleukin 2 for Signaling: Identifying Distant Structural Effects through Affordable Computations.

Int J Mol Sci 2018 Mar 20;19(3). Epub 2018 Mar 20.

Key Laboratory of Pesticide and Chemical Biology, Ministry of Education, Central China Normal University, Wuhan 430079, China.

A superkine variant of interleukin-2 with six site mutations away from the binding interface developed from the yeast display technique has been previously characterized as undergoing a distal structure alteration which is responsible for its super-potency and provides an elegant case study with which to get insight about how to utilize allosteric effect to achieve desirable protein functions. By examining the dynamic network and the allosteric pathways related to those mutated residues using various computational approaches, we found that nanosecond time scale all-atom molecular dynamics simulations can identify the dynamic network as efficient as an ensemble algorithm. The differentiated pathways for the six core residues form a dynamic network that outlines the area of structure alteration. The results offer potentials of using affordable computing power to predict allosteric structure of mutants in knowledge-based mutagenesis.
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http://dx.doi.org/10.3390/ijms19030916DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5877777PMC
March 2018

Palladium-Catalyzed C-H Silylation through Palladacycles Generated from Aryl Halides.

Angew Chem Int Ed Engl 2018 03 19;57(12):3233-3237. Epub 2018 Feb 19.

School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai, 200092, China.

A highly efficient palladium-catalyzed disilylation reaction of aryl halides through C-H activation has been developed for the first time. The reaction has broad substrate scope. A variety of aryl halides can be disilylated by three types of C-H activation, including C(sp )-H, C(sp )-H, and remote C-H activation. In particular, the reactions are also unusually efficient. The yields are essentially quantitative in many cases, even in the presence of less than 1 mol % catalyst and 1 equivalent of the silylating reagent under relatively mild conditions. The disilylated biphenyls can be converted into disiloxane-bridged biphenyls.
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http://dx.doi.org/10.1002/anie.201800330DOI Listing
March 2018

Synthesis of 9,9-Disubstituted Fluorenes from 2-Iodobiphenyls and α-Diazoesters under Palladium Catalysis.

J Org Chem 2018 01 8;83(2):1065-1072. Epub 2018 Jan 8.

School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University , 1239 Siping Road, Shanghai 200092, P. R. China.

9,9-Disubstituted fluorenes are widely employed in materials science. We have developed a straightforward approach for the synthesis of 9,9-disubstituted fluorenes from 2-iodobiphenyls and α-diazoesters. The reaction proceeds via a tandem palladium-catalyzed C(sp)-H activation/carbenoid insertion sequence.
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http://dx.doi.org/10.1021/acs.joc.7b02885DOI Listing
January 2018

Discrimination between benign and malignant breast lesions using volumetric quantitative dynamic contrast-enhanced MR imaging.

Eur Radiol 2018 Mar 19;28(3):982-991. Epub 2017 Sep 19.

Department of Radiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, No. 107 Yanjiang Road West, Guangzhou, Guangdong, 510120, China.

Objective: To determine the diagnostic performance of volumetric quantitative dynamic contrast-enhanced MRI (qDCE-MRI) in differentiation between malignant and benign breast lesions.

Methods: DCE-MRI was performed in 124 patients with 136 breast lesions. Quantitative pharmacokinetic parameters K, K, V, V and semi-quantitative parameters TTP, MaxCon, MaxSlope, AUC were obtained by using a two-compartment extended Tofts model and three-dimensional volume of interest. Morphologic features (lesion size, margin, internal enhancement pattern) and time-signal intensity curve (TIC) type were also assessed. Logistic regression analysis was used to determine predictors of malignancy, followed by receiver operating characteristics (ROC) analysis to evaluate the diagnostic performance.

Results: qDCE parameters (K, K, V, TTP, MaxCon, MaxSlope and AUC), morphological parameters and TIC type were significantly different between malignant and benign lesions (P≤0.001). Multivariate logistic regression analyses showed that K, K, MaxSlope, size, margin and TIC type were independent predictors of malignancy. The diagnostic accuracy of logistic models based on qDCE parameters alone, morphological features plus TIC type, and all parameters combined was 94.9%, 89.0%, and 95.6% respectively.

Conclusion: qDCE-MRI can be used to improve diagnostic differentiation between benign and malignant breast lesions in relation to morphology and kinetic analysis.

Key Points: • qDCE-MRI parameters are useful for discriminating between malignant and benign breast lesions. • K , K and MaxSlope were independent predictors of breast malignancy. • qDCE-MRI has a better diagnostic ability than morphology and kinetic analysis. • qDCE-MRI can be used to improve the diagnostic accuracy of breast malignancy.
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http://dx.doi.org/10.1007/s00330-017-5050-2DOI Listing
March 2018

An approach to spirooxindoles via palladium-catalyzed remote C-H activation and dual alkylation with CHBr.

Chem Commun (Camb) 2017 Sep 8;53(75):10429-10432. Epub 2017 Sep 8.

School of Chemical Science and Engineering, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai, 200092, P. R. China.

A facile and efficient approach for the synthesis of spirooxindoles has been developed via the coupling of spirocyclic C,C-palladacycles with CHBr. The key spirocyclic palladacycles are generated catalytically via remote C-H activation. A range of spirooxindoles can be synthesized in good to excellent yields from readily available starting material.
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http://dx.doi.org/10.1039/c7cc06196jDOI Listing
September 2017
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