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New strategy for synthesis of mercaptoundecahydrododecaborate derivatives via click chemistry: possible boron carriers and visualization in cells for neutron capture therapy.

Authors:
Mohamed E El-Zaria Hiroyuki Nakamura

Inorg Chem 2009 Dec;48(24):11896-902

Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan.

A new method that utilizes the click cycloaddition reaction to functionalize B(12)H(11)SH(2-) (BSH) with organic molecules was investigated. S,S-Dipropargyl-SB(12)H(11)(-) (1) and S-propargyl-SB(12)H(11)(2-) (4) were prepared from [(CH(3))(4)N](2)B(12)H(11)SH and [(CH(3))(4)N](2)B(12)H(11)S(CH(2))(2)CN (2) with propargyl bromide, respectively. Compound 1 or 4 reacted with various azides with mediation by Cu(II) ascorbate to give the corresponding bis-triazolo BSH derivatives (1-) or monotriazole BSH derivatives (2-), respectively, in excellent yields. The click cycloaddition reaction is very useful not only for the synthesis of various BSH-containing organic compounds for boron neutron capture therapy (BNCT) but also for the visualization of boron clusters in cells. We succeeded in the click cycloaddition reaction of compound 1 with Alexa Fluor 488 azide dye and found that 1 accumulated not in the cytoplasm but in the nuclei of HeLa cells.

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http://dx.doi.org/10.1021/ic902033cDOI Listing
December 2009

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