A new carbamoylation of tertiaryamines is reported. This rare C-H transformation features the direct generation of alpha-aminoalkyl radicals from tertiaryamines, 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
Visible-Light-Mediated Nucleophilic Addition of an α-Aminoalkyl Radical to Isocyanate or Isothiocyanate
作者:Hongxia Zhou、Ping Lu、Xiangyong Gu、Pixu Li
DOI:10.1021/ol402573j
日期:2013.11.15
A visible-light photoredox synthesis of α-amino amide or α-amino thioamide from N,N-dimethylaniline derivatives and aryl isocyanate or aryl isothiocyanate was developed. Bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III) (FIrpic) was found to be the effective catalyst among six catalysts screened. The reaction involves generation of α-aminoalkyl radicals from tertiary amines, followed