Radical Fixation of Functionalized Carbon Resources: α-sp<sup>3</sup>C−H Carbamoylation of Tertiary Amines with Aryl Isocyanates
作者:Takehiko Yoshimitsu、Kenichi Matsuda、Hiroto Nagaoka、Koji Tsukamoto、Tetsuaki Tanaka
DOI:10.1021/ol7023295
日期:2007.11.1
A new carbamoylation of tertiary amines is reported. This rare C-H transformation features the direct generation of alpha-aminoalkyl radicals from tertiary amines, followed by the addition of the resultant nucleophilic radicals to isocyanates, enabling unique access to N,N-dialkylated amino acid derivatives. The authors put forward a mechanistic proposal that is based on the isolation of borinamides
据报道,叔胺有新的氨基甲酰化作用。这种罕见的CH转化具有从叔胺直接生成α-氨基烷基的特征,然后将所得的亲核基团添加到异氰酸酯中,从而可以唯一地获得N,N-二烷基化的氨基酸衍生物。作者提出了一种机制建议,该建议基于分离通过用Et3B捕获氮自由基中间体而产生的硼酰胺的方法。本转化提供了一种从容易获得的材料生产甲哌卡因的新的一步法,这种药物是临床上重要的局部麻醉药。