The highly enantioselective transformation of silylketenes into α-silylthioesters catalysed by cinchona alkaloids
摘要:
The reaction of silylketenes with thiophenol, mediated by cinchona alkaloid catalysts, proceeds to give alpha -silylthioester products in good chemical yield and with enantiomeric excess values in the range 79-93%. The absolute configuration of one of the thioester products was determined by X-ray diffraction. (C) 2001 Elsevier Science Ltd. All rights reserved.
The highly enantioselective transformation of silylketenes into α-silylthioesters catalysed by cinchona alkaloids
摘要:
The reaction of silylketenes with thiophenol, mediated by cinchona alkaloid catalysts, proceeds to give alpha -silylthioester products in good chemical yield and with enantiomeric excess values in the range 79-93%. The absolute configuration of one of the thioester products was determined by X-ray diffraction. (C) 2001 Elsevier Science Ltd. All rights reserved.
Trimethylsilylacetic acid dianion: application to organic synthesis
作者:Paul A. Grieco、Chia-Lin J. Wang、Steven D. Burke
DOI:10.1039/c39750000537
日期:——
Trimethylsilylaceticacid readily forms the dianion (2) providing highly efficient routes to α-trimethylsilylcarboxylic acids, α,β-unsaturated acids, and α-trimethylsilyl-γ-butyrolactones; the latter can then be converted into α-ylidene-γ-butyrolactones, α-bromo-γ-butyrolactones and γ-butyrolactones.