Reactions of electron-deficient alkenes with dibromomethylene compounds activated by cyanide and ester groups were promoted by LiI to afford the corresponding cyclopropanes in high yields.
Reactions of electron-deficient alkenes with dibromomethylene compounds activated by cyano and ester groups were promoted by Lil or tetrabutylammonium bromide to afford the corresponding cyclopropanes in high yields. (C) 2009 Elsevier Ltd. All rights reserved.