An easy one-pot procedure for the synthesis of N-sulfonyl phosphorous ylides and sulfonyl iminophosphoranes

Abstract

Reaction of triphenylphosphine and an electron deficient acetylenic ester in the presence of strong N-H acid such as alkyl and aryl sulfamides or acetamide produces phosphorous ylides at room temperature in CH 2Cl2. The aryl sulfamide phosphoranes undergo a smooth transformation reaction in boiling toluene and produce iminophosphoranes. © Springer-Verlag 2007.