苯甲醛二甲缩醛 、
methyl (E)-5-[(1R)-1-cyclohexyl-2-oxo-2-trimethylsilyloxyethoxy]-2,2,4-trimethylpent-4-enoate 在
triphenylmethylium hexachloroantimonate(V) 作用下,
以
二氯甲烷 为溶剂,
反应 12.0h,
生成 (4R,5S)-4-((2R,4R)-4-Cyclohexyl-5-oxo-[1,3]dioxolan-2-yl)-5-methoxy-2,2,4-trimethyl-5-phenyl-pentanoic acid methyl ester 、
(4S,5S)-4-((2R,4R)-4-Cyclohexyl-5-oxo-[1,3]dioxolan-2-yl)-5-methoxy-2,2,4-trimethyl-5-phenyl-pentanoic acid methyl ester