(R)-1-{(2R,5S,7R,8S)-2-Butyl-7-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-8-methyl-1,6-dioxa-spiro[4.5]dec-2-yl}-prop-2-yn-1-ol 在
camphor-10-sulfonic acid 作用下,
以
氘代氯仿 为溶剂,
反应 24.0h,
以40%的产率得到(2R,3R,6S,8R,9S)-3-Butyl-8-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2-ethynyl-9-methyl-1,7-dioxa-spiro[5.5]undecan-3-ol