Nickel enolates in the Ni(CO)4 -induced carbonylation of gem-dibromocyclopropanes with silylamine or silylsulfide
作者:Toshikazu Hirao、Shinichiro Nagata、Yoshihiro Yamana、Toshio Agawa
DOI:10.1016/s0040-4039(01)80853-4
日期:——
were successfully used in the Ni(CO)4 -induced carbonylation reactions of gem-dibromocyclopropanes. The nickel carbenoid and enolate complexes are considered to be involved as key intermediates. Protonation afforded the cyclopropanecarboxylic acid derivatives. The presence of an electrophile achieved another stereoselective carbon-carbon bond formation via the nickel enolate intermediate.
甲硅烷基化合物(N,N-二烷基三甲基甲硅烷基胺,1-(三甲基甲硅烷基)-咪唑和苯硫基三甲基硅烷)已成功用于Ni(CO)4诱导的宝石-二溴环丙烷的羰基化反应。类胡萝卜素和烯醇化镍配合物被认为是关键中间体。质子化得到环丙烷羧酸衍生物。亲电子试剂的存在通过烯醇镍中间体实现了另一种立体选择性碳-碳键的形成。