Catalytic Asymmetric Synthesis of Chiral Propargylic Alcohols for the Intramolecular Pauson−Khand Cycloaddition
作者:Mark Turlington、Yang Yue、Xiao-Qi Yu、Lin Pu
DOI:10.1021/jo101545v
日期:2010.10.15
aldehydes are used to prepare the propargylic alcohol-based chiral en-ynes. Protection of the propargylic alcohols with either an acetyl or a methyl group allows the resulting en-ynes to undergo the intramolecularPauson−Khandreaction to form the corresponding optically active 5,5- and 5,6-fused bicyclic products with high diastereoselectivity and high enantiomeric purity. In the major product, the propargylic