New, General, and Practical Enamine Cyclopropanation Using Dichloromethane
作者:Chia-Chung Tsai、I-Lin Hsieh、Tsung-Ting Cheng、Ping-Kuei Tsai、Kuo-Wei Lin、Tu-Hsin Yan
DOI:10.1021/ol0604365
日期:2006.5.1
Dichloromethane serves as a novel electrophilic carbene equivalent which adds to an enamine double bond. The presence of other alkene moieties in the enamine partner is well tolerated. Even enamines derived from sterically hindered ketones react readily with dichloromethane promoted by TiCl4-Mg.
Acetyl chloride promoted cyclopropanations of alkenes with dibromomethane using zinc dust and copper(I) chloride in ether
作者:Edwin C. Friedrich、Eric J. Lewis
DOI:10.1021/jo00295a045
日期:1990.4
Electrochemical cyclopropanation of alkenes using dibromomethane and zinc in dichloromethane/DMF mixture
An efficient electrosynthesis of cyclopropanes from gem-dibromoalkanes and alkenes is achieved in a one-compartment cell fitted with a sacrificial zinc anode. The part played by the anodically generated Zn(II) in the coupling reaction is pointed out, and evidence for the existence of an organozinc species as intermediate is presented.
FRIEDRICH, EDWIN C.;LEWIS, ERIC J., J. ORG. CHEM., 55,(1990) N, C. 2491-2494