Conjugate addition of the anion derived from 3-(Phenylsulfinyl)prop-1-ene to Cyclopent-2-en-1-one

Abstract

The title anion in tetrahydrofuran containing one equivalent of hexamethylphosphoric triamide at - 78º undergoes a rapid conjugate addition reaction with cyclopent-2-en-1-one. The sole product obtained, in 73% yield, is (E)-3-[3-(phenylsulfinyl)prop-2-enyl]cyclopentan-1-one.