A one-pot reaction for the transformation of common secondaryamides into amines with C–C bond formation is described. This method consists of in situ amide activation with Tf2O–partial reduction–addition of C-nucleophiles. The method is general in scope, which allows employing both hard nucleophiles (RMgX, RLi) and soft nucleophiles, as well as enolates. With the use of soft nucleophiles, the reaction
Enantioselective reduction of <i>N</i>-alkyl ketimines with frustrated Lewis pair catalysis using chiral borenium ions
作者:Dan M. Mercea、Michael G. Howlett、Adam D. Piascik、Daniel J. Scott、Alan Steven、Andrew E. Ashley、Matthew J. Fuchter
DOI:10.1039/c9cc02900a
日期:——
Enantioselective reduction of ketimines was demonstrated using chiral N-heterocyclic carbene (NHC)-stabilised borenium ions in frustratedLewispair catalysis. High levels of enantioselectivity were achieved for substrates featuring secondary N-alkyl substituents. Comparative reactivity and mechanistic studies identify key determinants required to achieve useful enantioselectivity and represent a step