A new method for the synthesis of various 1,1-difluoroolefins is described. The key step is the treatment of 1-bromo-1,1-difluoro-2-alkenes with organo-metallic reagents in the presence of copper and lithium salts.
Stereoselective introduction of a bromo- (or chloro-) difluoromethyl allylic group
作者:Frédérique Tellier、Raymond Sauvêtre
DOI:10.1016/0040-4039(95)00703-f
日期:1995.6
A highly regio- and stereo-selective method for the introduction of a bromo- (or chloro-) difluoromethylene group into various unsaturated systems is described. The key step is the treatment of 1,1-difluoro-1-alken-3-ols with thionyl bromide or chloride.
Stereoselective synthesis of 1-bromo- (or 1-chloro-) 1,1-difluoro-2- alkenes
作者:Frédérique Tellier、Raymond Sauvêtre
DOI:10.1016/0022-1139(95)03340-8
日期:1996.1
A highly regio- and stereo-selective method for the introduction of a bromo- (or chloro-) difluoromethylene group into various unsaturated systems is described. The key step is the treatment of 1,1-difluoro-1-alken-3-ols with thionyl bromide (or chloride).
The treatment of l-bromo-l,1-difluoro-2-alkenes with organometallic reagents in the presence of copper and lithium salts leads to 1,1-difluoroolefins. (C) 1998 Published by Elsevier Science S.A. All rights reserved.