Reactions of some alkynyl halides with Samarium(II) iodide
作者:Zhihong Zhou、Denis Larouche、Sharon M. Bennett
DOI:10.1016/0040-4020(95)00703-b
日期:1995.10
Certain alkynyl halides (6-halo-1-ynes) react with samarium(II) iodide (SmI2) to give cyclized products (methylenecyclopentanes) in good yield. We have found some interesting evidence for the presence of radical and unstable organosamarium intermediates in these reductive cyclizations. Methyl 7-halohept-2-ynoates are not. however, good substrates for this cyclization methodology.
Nickel-Catalyzed Reductive Cyclization of Organohalides
作者:Hyejin Kim、Chulbom Lee
DOI:10.1021/ol200455n
日期:2011.4.15
A mild and convenient nickel-catalyzed method for free-radical cyclization of organohalides is described. The use of a NiCl2•DME/Pybox complex as the catalyst and zinc powder in methanol efficiently promotes the reductive cyclization of various unsaturated alkylhalides to give carbo-, oxa-, and azacycles as products in high yields.