DIRECT SYNTHESIS OF γ-BUTYROLACTONES VIA γ-PHENYL SUBTITUTED BUTYRIC ACIDS MEDIATED BENZYL RADICAL CYCLIZATION

Abstract

Synthesis of several γ-butyrolactones with aromatic substitution at carbon 5 from comparative γ-aryl acids with 25–85% yield are covered. The straight oxidation in the presence of peroxydisulphate-copper(II)chloride system in aqueous medium was applied. The reaction is highly regioselective and leads exclusively to γ-butyrolactone, through stable benzylic radical intermediate.

ACKNOWLEDGMENTS

We appreciate the Research Committee of Guilan University for the partial support given to this study.