(1R,4aR,4bS,7S,8aR,10aR)-7-(2-Hydroxy-ethyl)-1,4a,7-trimethyl-8-oxo-tetradecahydro-phenanthrene-1-carboxylic acid methyl ester 、
甲基磺酰氯 在
吡啶 作用下,
生成 (1R,4aR,4bS,7S,8aR,10aR)-7-(2-Methanesulfonyloxy-ethyl)-1,4a,7-trimethyl-8-oxo-tetradecahydro-phenanthrene-1-carboxylic acid methyl ester