(1S,2R,4aS,6aS,6bR,8aR,12aR,12bR,14bS,Z)-benzyl 11-((dimethylamino)methylene)-1,2,6a,6b,9,9,12a-heptamethyl-10-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-icosahydropicene-4a-carboxylate 、
N-amidino-β-alanine hydrochloride 在
sodium ethanolate 作用下,
以
乙醇 为溶剂,
反应 18.0h,
以44.9%的产率得到3-(((1S,2R,4aS,6aS,6bR,8aR,14aR,14bR,16bS)-4a-((benzyloxy)carbonyl)-1,2,6a,6b,9,9,14a-heptamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,14,14a,14b,15,16b-octadecahydrochryseno[1,2-g]quinazolin-11-yl)amino)propanoic acid