作者:Joseph R. Flisak、Kerry J. Gombatz、Monica M. Holmes、Alvydas A. Jarmas、Ivan Lantos、Wilford L. Mendelson、Vance J. Novack、James J. Remich、Lawrence Snyder
DOI:10.1021/jo00075a019
日期:1993.11
A highly efficient and enantioselective (>99.5% ee) synthesis of the title compound has been accomplished. Key steps include (1) epoxidation of unsaturated ketone 7 in the presence of a polyamino acid to afford compound 8 in >95% ee, (2) regioselective Baeyer-Villiger rearrangement of epoxy ketone 8 to afford glycidic ester 9, and (3) regioselective (35:1) opening of lithium glycidate 13 at C-3 with methyl 3-mercaptopropionate. The approach is economical, and all transformations proceed in high yield and are amenable to large-scale preparation.