Hydrazine hydrate (1:1) → 3-Chloro-4-{8-ethyl-2-[4-(4-methyl-piperazin-1-yl)-phenylamino]-7-oxo-7,8-dihydro-pyrido[2,3-d]pyrimidin-6-yl}benzoic acid hydrazide

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3-Chloro-4-{8-ethyl-2-[4-(4-methyl-piperazin-1-yl)-phenylamino]-7-oxo-7,8-dihydro-pyrido[2,3-d]pyrimidin-6-yl}benzoic acid methyl ester (6, 77 mg, 0.14 mmol) in the mixture of ethanol (4 mL) and hydrazine hydrate (1 mL) was heated at reflux for 2 h. The reaction mixture was cooled and the yellow precipitate was collected and washed with 2-propanol and diethyl ether to afford the title compound (40 mg, 0.08 mmol, 57%) as a yellow solid. ESMS m/z 533 (M+H)+; 1H NMR (400 MHz, DMSO-d6) δ ppm 9.94 (br. s., 2H) 8.77 (s, 1H) 7.95 (d, J=1.5 Hz, 1H) 7.87 (s, 1H) 7.83 (dd, J=7.8, 1.5 Hz, 1H) 7.66 (d, J=9.0 Hz, 2H) 7.51 (d, J=7.8 Hz, 1H) 6.94 (d, J=9.0 Hz, 2H) 4.56 (br. s., 2H) 4.36 (q, J=7.0 Hz, 2H) 3.05-3.15 (m, 4H) 2.42-2.48 (m, 4H) 2.22 (s, 3H) 1.28 (t, J=7.0 Hz, 3H).

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