在
哌啶 作用下,
以
溶剂黄146 、
苯 为溶剂,
生成 (3R,3aR,4R,5aS,5bS,7aS,10R,11S,11aS,13aS,13bR)-1-Formyl-4-hydroxy-3-hydroxymethyl-3,5a,10,11,13b-pentamethyl-3,3a,4,5,5a,5b,6,7,8,9,10,11,11a,13,13a,13b-hexadecahydro-cyclopenta[a]chrysene-7a-carboxylic acid methyl ester