(S)-2-(3-{(1S,2S,5S)-2-(tert-Butyl-dimethyl-silanyloxy)-5-[4-[(S)-2-(tert-butyl-dimethyl-silanyloxy)-5-hydroxy-hexyl]-2-(tert-butyl-dimethyl-silanyloxymethyl)-phenyl]-1-methyl-cyclopentyl}-propionylamino)-propionic acid 在
4-二甲氨基吡啶 、
2,4,6-三氯苯甲酰氯 、 camphor-10-sulfonic acid 、
三乙胺 作用下,
以
四氢呋喃 、
甲苯 为溶剂,
反应 2.0h,
生成 (2S,5S,6S,11S,17S)-5,17-Dihydroxy-22-hydroxymethyl-6,11,14-trimethyl-13-oxa-10-aza-tricyclo[17.2.2.0
2,6]tricosa-1(22),19(23),20-triene-9,12-dione