乙酸酐 、 (14 S)-3α-hydroxy-18α, 19α H-urs-12-en-27α-oic acid 以
吡啶 为溶剂,
反应 5.0h,
以60 mg的产率得到(1S,2S,4aR,6aR,6bR,8aR,10R,12aR,12bR,14bS)-10-Acetoxy-1,2,4a,6b,9,9,12a-heptamethyl-2,3,4,4a,5,6,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-octadecahydro-1H-picene-6a-carboxylic acid