(1S,2S)-N-phthaloyl-1,2-diaminocyclohexane 、
ethyl ent-16β-isothiocyanobeyeran-19-oate 以
二氯甲烷 为溶剂,
以71%的产率得到ethyl (4R,4aS,6aR,8R,9S,11aR,11bS)-8-(3-((1S,2S)-2-(1,3-dioxoisoindolin-2-yl)cyclohexyl)thioureido)-4,9,11b-trimethyltetradecahydro-6a,9-methanocyclohepta[a]naphthalene-4-carboxylate