A Versatile Synthesis of 3-Phenylsulfonylpyrroles from α-Amino Acids

Abstract

Reaction between α-benzamidoalkyl ketones 4a-e and the vinyl phosphonium salt 1 produces 3-phenylthio-3-pyrrolines 5a-e which can be converted into N-benzyl-3-phenylsulfonyl pyrroles 7a-e by m-CPBA oxidation, diborane reduction and DDQ aromatisation.