(5R,8S,9R,10R,13S,14S)-14-Hydroxy-13-methyl-1,7,17-trioxo-hexadecahydro-cyclopenta[a]phenanthrene-6,10-dicarboxylic acid 6-tert-butyl ester 10-methyl ester 在
对甲苯磺酸 作用下,
以
苯 为溶剂,
反应 1.5h,
生成 (5R,8S,9R,10S,13S,14S)-14-Hydroxy-13-methyl-1,7,17-trioxo-hexadecahydro-cyclopenta[a]phenanthrene-10-carboxylic acid methyl ester