(8S,11R)-11-(tert-Butyl-dimethyl-silanyloxy)-1-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl)-8-hydroxy-8-methyl-tetradec-13-ene-4,7-dione 在
2,6-二甲基吡啶 、
甲醇 、 camphor-10-sulfonic acid 作用下,
生成
(2R,5S,6S,8S,10S)-2-Allyl-5-(tert-butyl-dimethyl-silanyloxy)-10-(tert-butyl-dimethyl-silanyloxymethyl)-5-methyl-1,7,9-trioxa-dispiro[5.1.5.2]pentadecane