反应详情

4-Chloro-5,6,7,8-tetrahydrocinnoline-3-carboxylic acid ethyl ester (0.5 g), 2-fluorophenylhydrazine hydrochloride (0.34 g) and H{umlaut over (u)}nig's base (0.73 ml) in xylene were heated under reflux for 3 h. The solvent was evaporated under reduced pressure and the residue purified by flash chromatography using a gradient elution: CH2Cl2 (500 ml), CH2Cl2/(MeOH/NH3 10:1) 99:1 (500 ml), CH2Cl2/(MeOH/NH3 10:1) 98:2 (500 ml), CH2Cl2/(MeOH/NH3 10:1) 97:3 (500 ml), CH2Cl2/(MeOH/NH3 10:1) 96:4 (500 ml), CH2Cl2(MeOH/NH3 10:1) 95:5 (500 ml). The appropriate fractions were combined and evaporated under reduced pressure to give a solid (250 mg, 42%). δH (360 MHz; DMSO) 1.83 (4H, m, CH2), 2.61 (2H, t, J=5.3 Hz, CH2), 2.75 (2H, t, J=5.3 Hz, CH2), 7.30-7.57 (4H, m, ArH), m/z (ESP+) 285 (MH+). C15H13FN4O requires C, 63.37; H, 4.61; N, 19.71; found C, 63.18; H, 4.70; N, 19.35%.

1. temperatureunder reflux for 3 h
2. customThe solvent was evaporated under reduced pressure
3. customthe residue purified by flash chromatography
4. washa gradient elution
5. customevaporated under reduced pressure