C(O[C:4]([C:6]1[C:7]([CH:17]2[CH2:19][CH2:18]2)=[N:8][C:9]2[C:14]([C:15]=1Cl)=[CH:13][CH:12]=[CH:11][CH:10]=2)=[O:5])C.[NH:20]([C:22]1[CH:30]=[CH:29][C:25]([C:26]([OH:28])=[O:27])=[CH:24][CH:23]=1)[NH2:21].NN>C(O)C.CCCCCCC.Cl>[CH:17]1([C:7]2[NH:8][C:9]3[CH:10]=[CH:11][CH:12]=[CH:13][C:14]=3[C:15]3[C:6]=2[C:4](=[O:5])[N:20]([C:22]2[CH:23]=[CH:24][C:25]([C:26]([OH:28])=[O:27])=[CH:29][CH:30]=2)[N:21]=3)[CH2:18][CH2:19]1
4-chloro-2-cyclopropyl-quinoline-3-carboxylic acid ethyl ester (1.15 g, 0.0041 mols) and 4-hydrazino-benzoic acid (1.0 g, 0.0068 mols) were stirred in ethanol (30 ml) at reflux for 16 h. The bright yellow suspension was diluted with heptane, filtered, washed with cold t-butylmethyl ether and left to dry under suction to yield crude solid containing hydrazine. This solid was suspended in 1 M HCl, filtered, washed with water and then dried in vacuo to yield 4-(4-cyclopropyl-3-oxo-3,5-dihydro-pyrazolo[4,3-c]quinolin-2-yl)-benzoic acid (1.135 g, 80%) as a yellow solid, LCMS m/z 346.20 [M+H]+ @ RT 1.05 min: 96% purity.
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