Stereoselective lithiation of α,β-epoxy-γ,δ-vinylsilanes and transformation into α-silylated ketones
摘要:
A (cis)alpha,beta-epoxy-gamma,delta-vinyl-silane undergoes lithiation alpha to the silicon atom with retention of the configuration of the oxirane. This leads to new silylated vinyloxiranes with a quaternary silylated stereogenic carbon atom. We show here the possible and efficient rearrangement of a methyl substituted adduct into a beta,gamma-unsaturated-alpha-silylated ketone. (C) 2003 Elsevier Ltd. All rights reserved.