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.
某些炔基卤化物(6-卤-1-炔)与碘化sa(II)(SmI 2)反应,以高收率得到环化产物(亚甲基环戊烷)。我们发现了一些有趣的证据,表明这些还原环化反应中存在自由基和不稳定的有机sa中间体。7-卤代庚二酸甲酯不是。但是,这种环化方法具有良好的底物。