Benzenamine, 4-(phenylmethyl)- → 7-Benzyl-1-methyl-1,4-dihydro-pyrazolo[4,3-b]quinolin-9-one

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A mixture of 4-iodo-1-methyl-1H-pyrazole-5-carboxylic acid ((Manaev, Yu. A. et al., J. Gen. Chem. USSR (Engl. Transl.), 1982, 52 (11), 2291), 8.0 g, 31.74 mmol), 4-benzylaniline (21.03 g, 114.76 mmol) and copper powder (3.2 g) in a mixture of 5% aqueous sodium carbonate (160 ml) and dimethylsulfoxide (80 ml) was stirred for 17 h at 100° C. After cooling to room temperature, the mixture was filtered through a pad of Celite, which was washed with water, 2N aqueous sodium hydroxide and diethyl ether. The separated water layer was washed with diethyl ether (100 ml×2). The water layer was acidified with concentrated hydrochloric acid and the formed solid was collected by filtration, dried, to give 4.86 g (50%) of the pure title compound as a pale brown solid.

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