反应详情

4-Chloro-5,6,7,8-tetrahydrocinnoline-3-carboxylic acid ethyl ester (0.5 g), 4-methoxyphenylhydrazine hydrochloride (0.37 g) and potassium carbonate (0.29 g) in xylene were heated under reflux for 3 h. The solid was collected by filtration, washed with hexane, then water. The residue was absorbed onto silica and purified by flash chromatography using a gradient elution: CH2Cl2 (250 ml), CH2Cl2/(MeOH/NH3 10:1) 99:1 (250 ml), CH2Cl2/(MeOH/NH3 10:1) 98:2 (250 ml), CH2Cl2/(MeOH/NH3 10:1) 97:3 (250 ml), CH2Cl2/(MeOH/NH3 10:1) 96:4 (250 ml), CH2Cl2/(MeOH/NH3 10:1) 95:5 (250 ml). The appropriate fractions were combined and evaporated under reduced pressure to give a solid (79 mg, 13%). δH (360 MHz; DMSO) 1.83 (4H, m, CH2), 2.67 (2H, t, J=5.3 Hz, CH2), 2.72 (2H, d, J=5.3 Hz, CH2), 3.78 (3H, s, OCH3), 7.02 (2H, d, J=9 Hz, ArH), 8.06 (2H, d, J=9 Hz, CH2), m/z (ESP+) 297 (MH+).

1. temperatureunder reflux for 3 h
2. filtrationThe solid was collected by filtration
3. washwashed with hexane
4. customThe residue was absorbed onto silica
5. custompurified by flash chromatography
6. washa gradient elution
7. customevaporated under reduced pressure