8-ethyl-3-hydroxy-2-(1-phenylcyclopropyl)quinoline-4-carboxylic acid 、
5-甲氧基靛红 、
2-(1-(4-chlorophenyl)cyclopropyl)-2-oxoethyl acetate 以to yield Compound 20 (0.07 g, 19% yield)的产率得到2-(1-(4-chlorophenyl)cyclopropyl)-3-hydroxy-6-methoxyquinoline-4-carboxylic acid