[(2S,3S,6S)-6-[(2R)-3-[tert-butyl(dimethyl)silyl]oxy-2-hydroxypropyl]-2-hydroxy-4-(2-methoxy-2-oxoethylidene)-2-(2-methyl-5-oxopent-3-en-2-yl)oxan-3-yl] octanoate 、
(R)-3-(tert-Butyl-dimethyl-silanyloxy)-4-[(2S,6R)-6-((2S,7S,10R)-7-isopropyl-10-methyl-1,5-dioxa-spiro[5.5]undec-2-ylmethyl)-tetrahydro-pyran-2-yl]-butyric acid 在
2,4,6-三氯苯甲酰氯 、
4-二甲氨基吡啶 作用下,
以
甲苯 为溶剂,
反应 1.25h,
以79%的产率得到[(2S,3S,6S)-6-[(2R)-3-[tert-butyl(dimethyl)silyl]oxy-2-[(3R)-3-[tert-butyl(dimethyl)silyl]oxy-4-[(2S,6R)-6-[[(4S,8R,11S)-8-methyl-11-propan-2-yl-1,5-dioxaspiro[5.5]undecan-4-yl]methyl]oxan-2-yl]butanoyl]oxypropyl]-2-hydroxy-4-(2-methoxy-2-oxoethylidene)-2-(2-methyl-5-oxopent-3-en-2-yl)oxan-3-yl] octanoate