Single step stereospecific transformation of 2-phenylthio secondary amides into (Z)-3-chloro-2-phenylthio acrylamides
作者:Anita R. Maguire、Maureen E. Murphy、Marcel Schaeffer、George Ferguson
DOI:10.1016/0040-4039(94)02288-m
日期:1995.1
α-Phenylthio secondary propanamides 1a-e are converted stereospecifically on treatment with NCS to the analogous (Z)-α-phenylthio-β-chloro propenamides 2a-e. Extension to longer chain secondary amide derivatives 1f-g is also possible, albeit less efficiently and without any appreciable stereoselectivity.
Treatment of a series of alpha-thioamides with N-chlorosuccinimide results in efficient transformation to the analogous alpha-thio-beta-chloroacrylamides. The mechanistic pathway has been established through isolation and characterisation of intermediate compounds. The scope of the transformation has been explored-aryl and alkylthio substituents, primary, secondary and tertiary amides can be employed