2-Diazo-1-[(3S,8R,9S,10R,13R,14S,17S)-3-hydroxy-17-((R)-1-hydroxy-ethyl)-10-methyl-1,2,3,4,7,8,9,10,11,12,14,15,16,17-tetradecahydro-cyclopenta[a]phenanthren-13-yl]-ethanone 在
N-甲基-4-哌啶酮 、 aluminum isopropoxide 作用下,
以
甲苯 为溶剂,
反应 2.0h,
以88%的产率得到(8R,9S,10R,13R,14S,17S)-13-(2-Diazo-acetyl)-17-((R)-1-hydroxy-ethyl)-10-methyl-1,2,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-cyclopenta[a]phenanthren-3-one