摘要:
Dicobalt hexacarbonyl complexes of menthyl-substituted propargyl alcohol react with PR(3) (R = OMe, Ph) to form diastereomeric mixtures of complexes 3. The isomeric complexes can be separated chromatographically. The isolated diastereomers can be used in the intra- and intermolecular Pauson-Khand reaction to give high yields of cyclopentenones with high diastereoselectivities or high enantioselectivities.