(1E,3R,4S,6R,9S,10S,11S,13S,16R,17R,18S,19S,20Z)-10,16-bis[[tert-butyl(dimethyl)silyl]oxy]-1-iodo-3,9,11,13,17,19-hexamethyltricosa-1,20,22-triene-4,6,18-triol 、
2,2-二甲氧基丙烷 在
4-甲基苯磺酸吡啶 作用下,
反应 2.0h,
以90%的产率得到(3Z,5S,6S,7R,8R,11S,13S,14S,15S)-8,14-bis[[tert-butyl(dimethyl)silyl]oxy]-17-[(4R,6S)-6-[(E,2R)-4-iodobut-3-en-2-yl]-2,2-dimethyl-1,3-dioxan-4-yl]-5,7,11,13,15-pentamethylheptadeca-1,3-dien-6-ol