Synthesis of α-alkenyl-β-hydroxy adducts by α-addition of unprotected 4-bromocrotonic acid and amides with aldehydes and ketones by chromium(II)-mediated reactions
作者:Ludger A. Wessjohann、Harry Wild、Leonildo A. Ferreira、Henri S. Schrekker
Bis(triméthylsiloxy)-1,1 butadiène-1,3 et triméthylsilyl-4 butène-2 oate de triméthylsilyle: préparations et réactions avec le benzaldéhyde
作者:M. Bellassoued、R. Ennigrou、M. Gaudemar
DOI:10.1016/0022-328x(88)80497-2
日期:1988.1
The preparations of 4-trimethylsilyl-2-butenoate trimethylsilyl ester and 1,1- bis(trimethylsiloxy)-1,3-butadiene are described. The latter silyl derivative reacts with benzaldehyde in the presence of ZnBr2 in THF to give exclusively γ-substituted product (E configuration) in high yield. The fluoride ion catalyzedreaction affords predominantly α-alkylated compounds.