The Aminomethylation of Electron-Rich Aromatics with an <i>N</i>-Silyl-<i>N</i>,<i>O</i>-Acetal Catalyzed by a Metal Triflate-TMSCl System: Facile Synthesis of Aromatic Primary Amines, 1-Aryl-trichloroethylamines
作者:Norio Sakai、Maki Hirasawa、Toshihiro Hamajima、Takeo Konakahara
DOI:10.1021/jo026465k
日期:2003.1.1
The copper(II) triflate- and hafnium(IV) triflate-catalyzed aminomethylation of indole (2) with an N-silyl-N,O-acetal 1 containing a trichloromethyl group provides the primary amine derivative (3a) in modest yield. When 1 equiv of trimethylchlorosilane (TMSCl) was added to the reaction mixture, the reaction proceeded smoothly, and the yield of 3a was dramatically improved (>90%). The use of this catalytic
用含有三氯甲基的N-甲硅烷基-N,O-乙缩醛1的三氟甲磺酸铜(II)和三氟甲磺酸ha(IV)催化的吲哚氨基甲基化可提供适度收率的伯胺衍生物(3a)。当将1当量的三甲基氯硅烷(TMSCl)添加到反应混合物中时,反应平稳进行,并且3a的产率显着提高(> 90%)。该催化体系的使用允许将氨基甲基基团引入带有各种官能团的吲哚2a-h上,其似乎使路易斯酸失活,产率为52-92%。掺杂Hf(OTf)4的TMCSI催化了各种富电子芳族化合物4a-j的成功氨甲基化,从而生成了1-芳基-三氯乙胺衍生物5a-j。