在
甲醇 、
4-甲基苯磺酸吡啶 作用下,
反应 20.0h,
以65%的产率得到[(1S,3S,7R,8E,11S,12S,13E,15S,17R,21R,23S,25S)-25-acetyloxy-17-[(1R)-1-[tert-butyl(dimethyl)silyl]oxyethyl]-21-[tert-butyl(diphenyl)silyl]oxy-11-hydroxy-1-methoxy-13-(2-methoxy-2-oxoethylidene)-10,10,26,26-tetramethyl-5-methylidene-19-oxo-18,27,28,29-tetraoxatetracyclo[21.3.1.13,7.111,15]nonacos-8-en-12-yl] butanoate