Cyclopropyl Building Blocks for Organic Synthesis. Part 137. Pauson—Khand Carbonylative Cocyclizations of Acetylenes with Cyclopropylallenes.

Abstract

The reaction of allenes (II) proceeds without opening of the cyclopropyl ring providing 4-(cyclopropylmethylene)cyclopentenones in a regioselective manner. -(AHMAR, M.; KNOKE, M.; DE MEIJERE, A.; CAZES*, B.; Synthesis 2007, 3, 442-446; Lab. Chim. Org., CNRS, Univ. Claude Bernard Lyon, F-69622 Villeurbanne, Fr.; Eng.) -Mais 23-060