(S)-3-(tert-butyl-dimethyl-silanyloxy)-5-[(4S,5R)-2,2,4-trimethyl-5-((E)-(R)-3-methyl-4-trityloxy-but-1-enyl)-[1,3]dioxolan-4-yl]-pentanoic acid methyl ester 在
三氯化硼 作用下,
以
二氯甲烷 为溶剂,
反应 0.5h,
以85%的产率得到(S)-3-(tert-butyl-dimethyl-silanyloxy)-5-[(4S,5R)-5-((E)-(R)-4-hydroxy-3-methyl-but-1-enyl)-2,2,4-trimethyl-[1,3]dioxolan-4-yl]-pentanoic acid methyl ester