3-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bS)-1-(3-(tert-butoxycarbonyl(2-(dimethylamino)ethyl)amino)prop-1-en-2-yl)-9-(4-(tert-butoxycarbonyl)phenyl)-5a,5b,8,8,11a-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysene-3a-carboxamido)propanoic acid 、
三氟乙酸 在
氮 、
1,4-二氧六环 、
甲醇 、 expected product 作用下,
以
二氯甲烷 为溶剂,
反应 16.5h,
以to give 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bS)-3a-(2-carboxyethylcarbamoyl)-1-(3-(2-(dimethylamino)ethylamino)prop-1-en-2-yl)-5a,5b,8,8,11a-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl)benzoic acid (6.2 mg, 8.66 μmol, 13.5% yield over 4 steps) as a white solid的产率得到4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bS)-3a-(2-carboxyethylcarbamoyl)-1-(3-(2-(dimethylamino)ethylamino)prop-1-en-2-yl)-5a,5b,8,8,11a-pentamethyl-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl)benzoic acid