Acetic acid (1S,3R,4S,7S,9S,13S,14R,15R)-3,4-dihydroxy-4,9,13-trimethyl-18-methylene-17-oxo-8,16-dioxa-tricyclo[13.3.0.0
7,9]octadec-14-yl ester 在
对甲苯磺酸 作用下,
以
苯 为溶剂,
反应 1.5h,
以50%的产率得到Acetic acid (1S,2R,4S,8R,9R,10S,14S,15R)-2,14-dihydroxy-1,10,14-trimethyl-5-methylene-6-oxo-7,18-dioxa-tricyclo[13.2.1.0
4,8]octadec-9-yl ester