ethyl 1-((1R,3S)-3-amino-2,2-dimethylcyclobutanecarbonyl)piperidine-4-carboxylate 、 在
palladium diacetate
三乙基硅烷 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
生成 (1R,3S)-3-(((1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-3a-((1S,3R)-3-(4-(ethoxycarbonyl)piperidine-1-carbonyl)-2,2-dimethylcyclobutylcarbamoyl)-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysen-9-yloxy)carbonyl)-2,2-dimethylcyclobutanecarboxylic acid