(3S,2'R,3'S,4'Z,6'R,7'S)-2-{(2'-allyl-6'-benzyloxy-7'-benzyloxymethyl-2',3',6',7'-tetrahydrooxepin-3'-yl)oxy}hex-5-en-1,3-diol 、
2,2-二甲氧基丙烷 在
camphor-10-sulfonic acid 作用下,
以
二氯甲烷 为溶剂,
反应 3.0h,
以50%的产率得到(2R,3S,4Z,6R,7S,4'S,5'S)-2-allyl-3-{(4'-allyl-2',2'-dimethyl-1',3'-dioxan-5'-yl)oxy}-6-benzyloxy-7-benzyloxymethyl-2,3,6,7-tetrahydrooxepin