Synthesis and Fluoride-Promoted Wittig Rearrangements of α-Alkoxysilanes
摘要:
[GRAPHICS]Lewis acid-catalyzed reaction of allyl and benzyl trichloroacetimidates with alpha-silyl alcohols was found to be a general method for the synthesis of alpha-alkoxysllanes. Upon exposure to CsF, these alpha-alkoxysilanes could be made to undergo [2,3]-Wittig rearrangement with an efficiency similar to that realized by the analogous but inherently more toxic alpha-alkoxystannanes.
The asymmetric hydroboration of simple alkenylsilanes: chiral α-silylalkyl- boranes and alcohols
作者:John A. Soderquist、Shwn-Ji Hwang Lee
DOI:10.1016/s0040-4020(01)86654-0
日期:1988.1
The detailed study of the asymmetric hydroboration of various vinyl-silanes with monoisopinocampheylborane ( IPCBH2) is presented. In all cases, β-substitution on the vinylsilane gives monomericdialkylborane adducts with the boryl group α to the silicon. These studies show that the larger the groups on silicon are, the more positive the influence on the enantioselectivity of the process. Moderate