(S)-methyl 2-((1S,3R)-3-amino-2,2-dimethylcyclobutanecarboxamido)-4-methylpentanoate 、 3-O-acetylbetulinic acid chloride 以
二氯甲烷 为溶剂,
反应 16.0h,
生成 (S)-methyl 2-((1S,3R)-3-((1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-acetoxy-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxamido)-2,2-dimethylcyclobutanecarboxamido)-4-methylpentanoate