2 results match your criteria 3-exo-tet ring-closure

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Redox-Neutral Photocatalytic Cyclopropanation via Radical/Polar Crossover.

J Am Chem Soc 2018 06 19;140(25):8037-8047. Epub 2018 Jun 19.

Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States.

A benchtop stable, bifunctional reagent for the redox-neutral cyclopropanation of olefins has been developed. Triethylammonium bis(catecholato)iodomethylsilicate can be readily prepared on multigram scale. Using this reagent in combination with an organic photocatalyst and visible light, cyclopropanation of an array of olefins, including trifluoromethyl- and pinacolatoboryl-substituted alkenes, can be accomplished in a matter of hours. Read More

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Expedient synthesis of substituted (S)-N-(alpha-methylbenzyl)aziridines.

Chem Commun (Camb) 2006 Sep 11(33):3513-5. Epub 2006 Jul 11.

School of Chemical Sciences & Pharmacy, University of East Anglia, Norwich, Norfolk, UK.

We report for the first time that after O-acylation the conjugate addition products of (S)-N-(alpha-methylbenzyl)hydroxylamine undergo an efficient diastereoselective 3-exo-tet ring-closure reaction affording 2- and 2,3-disubstituted-N-alkylaziridines in good to excellent yields. Read More

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September 2006
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