(3S,7R,8R,10S,11S,12S,13S,16E,22S)-11-[tert-butyl(dimethyl)silyl]oxy-10,12-dimethoxy-5-(4-methoxyphenyl)-8,18,18-trimethyl-13-propan-2-yl-4,6,14,20-tetraoxa-1-azatricyclo[20.4.0.03,7]hexacos-16-ene-2,15,21-trione 在
4-甲基苯磺酸吡啶 、
二甲基亚砜 、
三氟乙酸酐 作用下,
以
甲醇 为溶剂,
生成 (E)-(8R,10S,11S,12S,13S,21aS)-11-(tert-Butyl-dimethyl-silanyloxy)-13-isopropyl-10,12-dimethoxy-8,18,18-trimethyl-1,3,4,8,9,10,11,12,13,18,19,21a-dodecahydro-2H-14,20-dioxa-4a-aza-benzocyclononadecene-5,6,7,15,21-pentaone