ortho-Selective Nucleophilic Addition of Primary Amines to Silylbenzynes: Synthesis of 2-Silylanilines
作者:Takashi Ikawa、Tsuyoshi Nishiyama、Takashi Shigeta、Shinya Mohri、Shinsuke Morita、Sho-ichi Takayanagi、Yuki Terauchi、Yuki Morikawa、Akira Takagi、Yoshinobu Ishikawa、Satoshi Fujii、Yasuyuki Kita、Shuji Akai
DOI:10.1002/anie.201100360
日期:2011.6.14
ortho‐selective nucleophilic addition reaction of amines to 3‐substituted benzynes has been achieved. Despite a large trimethylsilyl substituent, primary amines attack the C2 position of 3‐silylbenzynes to produce 2‐silylanilines (see scheme). This outcome is likely to result from the inductive electron‐donating effect of the silyl group, which overrides its steric repulsion with the approaching amines.
原因:首先实现了胺与3-取代的苯炔的首次邻位选择性亲核加成反应。尽管有一个较大的三甲基甲硅烷基取代基,但伯胺会攻击3-甲硅烷基苯并的C2位置生成2-甲硅烷基苯胺(请参见方案)。该结果可能是由于甲硅烷基的感应给电子效应所致,该效应将其空间位阻与接近的胺相抵消。