Asymmetric Synthesis of SM-9164, a Biologically Active Enantiomer of Antifungal Agent SM-8668
作者:Hiroshi Miyauchi、Toshio Nakamura、Naohito Ohashi
DOI:10.1246/bcsj.69.2625
日期:1996.9
SM-9164, a biologically active enantiomer of antifungal agent SM-8668, was prepared by asymmetric synthesis in 10 steps in 13% overall yield from commercially available 2-chloro-1-(2,4-difluorophenyl)ethanone. The crucial steps were Katsuki-Sharpless asymmetric epoxidation of the (E)-allylic alcohol and epimerization of the erythro-sulfone to the desired threo-isomer under basic conditions.
SM-9164是抗真菌剂SM-8668的生物活性对映体,通过不对称合成法在10个步骤中,从市售的2-氯-1-(2,4-二氟苯基)乙酮中获得,总产率为13%。关键步骤包括(Katsuki-Sharpless)不对称环氧化(E)-烯醇和在碱性条件下将红细胞亚磺酸酯异构化为所需的threo-异构体。