4-[[(3aR,5aR,5bR,7aR,9S,11aR,11bR,13aS)-3a-[2-[(4-chlorophenyl)methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]acetyl]-5a,5b,8,8,11a-pentamethyl-2-oxo-1-propan-2-yl-4,5,6,7,7a,9,10,11,11b,12,13,13a-dodecahydro-3H-cyclopenta[a]chrysen-9-yl]oxy]-2,2-dimethyl-4-oxobutanoic acid 在
三氟乙酸 、
碳酸氢钠 作用下,
以
二氯甲烷 、
水 为溶剂,
反应 1.0h,
以29.5%的产率得到4-{[(3aR,5aR,5bR,7aR,9S,11aR,11bR,13aS)-3a-[{[(4-chlorophenyl)methyl]amino}acetyl]-5a,5b,8,8,11a-pentamethyl-1-(1-methylethyl)-2-oxo-3,3a,4,5,5a,5b,6,7,7a,8,9,10,11,11a,11b,12,13,13a-octadecahydro-2H-cyclopenta[a]chrysen-9-yl]oxy}-2,2-dimethyl-4-oxo-butanoic acid