Propionic acid 2-((3aS,4S,5aR,7R)-5a,7-dihydroxy-4-methanesulfonyloxy-6a,11b-dimethyl-2-oxo-3,3a,4,5,5a,6,6a,7,8,9,9a,9b,10,11,11b,11c-hexadecahydro-2H-cyclopenta[a]pyren-7-yl)-2-oxo-ethyl ester 在
lithium carbonate 、 lithium bromide 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成
Propionic acid 2-((3aR,5aR,7R)-5a,7-dihydroxy-6a,11b-dimethyl-2-oxo-3,3a,5a,6,6a,7,8,9,9a,9b,10,11,11b,11c-tetradecahydro-2H-cyclopenta[a]pyren-7-yl)-2-oxo-ethyl ester