Cyclopropanation of electron-deficient alkenes with activated dibromomethylene compounds mediated by lithium iodide or tetrabutylammonium salts
摘要:
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.
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.
A New Synthetic Route to Electrophilic Cyclopropane Derivatives from Olefins
作者:Nariyoshi Kawabata、Shinji Yano、Jiro Hashimoto、Jun-ichi Yoshida
DOI:10.1246/bcsj.54.2539
日期:1981.8
1-Bis(alkoxycarbonyl)-, 1-alkoxycarbonyl-1-cyano-, and 1,1-dicyanocyclopropane derivatives were obtained in 10–99% yields by the reaction of Br2C(COOR)2, Br2C(CN)(COOR), and KBr[Br2C(CN)2]4, respectively, with olefins and Cu2Br2 in dimethyl sulfoxide (DMSO).
Cyclopropanation of electron-deficient alkenes and wideqvist-type synthesis of cyclopropanes mediated by indium metal
作者:Shuki Araki、Yasuo Butsugan
DOI:10.1039/c39890001286
日期:——
Cyclopropanation of electron-deficientalkenes and Wideqvist-type transformation of carbonyl compounds to cyclopropanes have been achieved by the action of active methylene dibromides and metallic indium.