A NOVEL, ONE-STEP ANNULATION PROCESS FOR THE SYNTHESIS OF RING-FUSED 2-CYCLOPENTENONES

Article abstract of DOI:10.1016/S0040-4039(00)96697-8

The reaction of the dilithio derivative of dimethyl cis-4-cyclohexen-1,2-dicarboxylate with 3-substitued propiolic acid phenyl esters proceeds via an unusual mechanistic path to generate fused bicyclic 2-cyclopentanones in a single step.