Regio- and stereospecific cleavage of α,β-epoxysilanes with lithium phenylsulfide
作者:Purificación Cuadrado、Ana M González-Nogal
DOI:10.1016/s0040-4039(99)02242-x
日期:2000.2
Trimethyl- or dimethylphenylsilylepoxides react with lithium phenylsulfide to give regio- and stereodefined vinyl sulfides resulting from α-ring opening and Peterson elimination. When the epoxide bears the bulky tert-butyldiphenylsilyl group the reaction is more puzzling. Depending on the β-substitution and the presence of aluminium chloride, we obtained silyl enol ethers, α-silylaldehydes or α-hy
Regio- and Stereospecific Cleavage of α,β-Epoxysilanes with Lithium Diphenylphosphide
作者:Purificación Cuadrado、Ana M González - Nogal
DOI:10.1016/s0040-4039(97)10123-x
日期:1997.11
Silyl epoxides In-e react with lithium diphenylphosphide and then with methyl iodide to give vinylphosphonium iodides resulting from alpha-opening of the epoxide ring and subsequent Peterson elimination. In the same conditions, the E-beta-phenyl-alpha-tert-butyldiphenylsilylepoxide If leads to the corresponding silyl enol ether 5 by beta-opening followed by Brook rearrangement. Both processes are regio-and stereospecific. (C) 1997 Elsevier Science Ltd.