Ethyl 6-amino-5-cyano-2-methyl-4-[4-(trifluoromethyl)phenyl]-1,4-dihydropyridine-3-carboxylate 、
4-甲基环己酮 在
aluminum (III) chloride 作用下,
以
1,2-二氯乙烷 为溶剂,
以90%的产率得到5-amino-2,7-dimethyl-4-(4-trifluoromethylphenyl)-1,4,6,7,8,9-hexahydrobenzo[b][1,8]naphthyridine-3-carboxylic acid ethyl ester