Regio- and Stereospecific Cleavage of Silyl- and Disilylepoxides with Lithium Diphenylphosphide
作者:Purificación Cuadrado、Ana M. González-Nogal、M. Angeles Sarmentero
DOI:10.1002/chem.200400239
日期:2004.9.20
react stereospecifically with lithium diphenylphosphide, optionally followed by methylation, to give vinylphosphonium iodides or vinylphosphine oxides resulting from alpha-opening and silylenolethers, vinylsilanes or alpha-hydroxysilanes by beta-opening. On the other hand, alpha,beta- or alpha,alpha-disilylepoxides afforded beta-silyl vinylphosphine oxides or alpha-silylated silylenolethers by alpha-
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.