octadecyl solketal-4-nitrophenyl carbonate 、 methyl (1R,2S,6R,8R,13S,14R,15R,16S,17S)-10,15,16-trihydroxy-3-[2-(1-hydroxycyclohexyl)acetyl]oxy-9,13-dimethyl-4,11-dioxo-5,18-dioxapentacyclo[12.5.0.01,6.02,17.08,13]nonadec-9-ene-17-carboxylate 在
4-二甲氨基吡啶 作用下,
以
二氯甲烷 为溶剂,
生成 methyl (1R,2S,6R,8R,13S,14R,15R,16S,17S)-15,16-dihydroxy-3-[2-(1-hydroxycyclohexyl)acetyl]oxy-9,13-dimethyl-4,11-dioxo-10-[(2-pentadecyl-1,3-dioxolan-4-yl)methoxycarbonyloxy]-5,18-dioxapentacyclo[12.5.0.01,6.02,17.08,13]nonadec-9-ene-17-carboxylate