(2S,4S)-4-methyl-5-methylene-2-phenethyl-1,3-dioxolane 、
tert-butyl (2-(1-hydroxy-3-(phenylthio)propyl)-4-methoxy-5-methylphenyl) carbonate 在
甲基溴化镁 作用下,
以
乙醚 为溶剂,
反应 3.0h,
以81%的产率得到(2R,2'S,4S,5'S)-6-methoxy-5',7-dimethyl-2'-phenethyl-4-(2-(phenylthio)ethyl)spiro[chroman-2,4'-[1,3]dioxolane]