methyl (1R,2R,5R,7S,8S,9R,10R,13R,14R,15R,18S)-7-acetyloxy-1,2,6,6,9-pentamethyl-15-prop-1-en-2-yl-18-(trityloxymethyl)pentacyclo[11.7.0.02,10.05,9.014,18]icosane-8-carboxylate 在
4-甲基苯磺酸吡啶 作用下,
以
乙醇 为溶剂,
以89%的产率得到methyl (1R,2R,5R,7S,8S,9R,10R,13R,14R,15R,18S)-7-acetyloxy-18-(hydroxymethyl)-1,2,6,6,9-pentamethyl-15-prop-1-en-2-ylpentacyclo[11.7.0.02,10.05,9.014,18]icosane-8-carboxylate