methyl (5R,8R,9R,10S,13S,14R,17S)-17-(methoxymethoxy)-13-methyl-1,7-dioxo-3,4,5,6,8,9,11,12,14,15,16,17-dodecahydro-2H-cyclopenta[a]phenanthrene-10-carboxylate 在
盐酸 作用下,
以
甲醇 为溶剂,
反应 0.25h,
以99%的产率得到methyl (5R,8R,9R,10S,13S,14R,17S)-17-hydroxy-13-methyl-1,7-dioxo-3,4,5,6,8,9,11,12,14,15,16,17-dodecahydro-2H-cyclopenta[a]phenanthrene-10-carboxylate