Acetic acid 2-[(2S,4R,6R,8S,9R,11R)-4-(tert-butyl-dimethyl-silanyloxy)-8-isopropyl-11-methanesulfonyloxy-9-methyl-1,7-dioxa-spiro[5.5]undec-2-yl]-ethyl ester 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 、
lithium chloride 作用下,
以
二甲基亚砜 为溶剂,
反应 2.0h,
以75%的产率得到Acetic acid 2-[(2S,4R,6R,8S,9R)-4-(tert-butyl-dimethyl-silanyloxy)-8-isopropyl-9-methyl-1,7-dioxa-spiro[5.5]undec-10-en-2-yl]-ethyl ester