反应详情

A mixture of 2-methyl-6-morpholin-4-ylmethylene-5,6-dihydro-4H-benzothiazol-7-one (210 mg, 7.94 mmol), N-(3-hydroxy-phenyl)-guanidine nitrate (170 mg, 7.94 mmol), NaOH (32 mg, 7.94 mmol), and 2-methoxyethanol (2 mL) was heated under reflux for 16 h. The reaction mixture was concentrated under vacuum. Flash column chromatography (10% MeOH:EtOAc) gave the pure title product as a yellow solid (20 mg, 8%): mp 310° C. (dec). Anal. RP-HPLC: tR 10.3 min (0-60% MeCN, purity 92%). 1H-NMR (DMSO-d6): δ 9.50 (s, 1H, OH/NH), 9.28 (s, 1H, OH/NH), 8.38 (s, 1H, Py-H), 7.37 (t, 1H, J 2.3, Ph-H), 7.27 (ddd, 1H, J 8.3, 2.3, 0.7, Ph-H), 7.08 (t, 1H, J 8.3, Ph-H), 6.40 (ddd, 1H, J 8.3, 2.3, 0.7, Ph-H), 3.05 (m, 4H, CH2—CH2), 2.78 (s, 3H, CH3). 13C-NMR (DMSO-d6): δ 168.71, 159.05, 158.88, 157.42, 155.97, 155.20, 141.75, 128.81, 127.83, 115.89, 109.69, 108.35, 105.87, 24.72, 23.09, 19.38. MS (ESI+): m/z 311.06 (M+H)+.

1. temperaturewas heated
2. temperatureunder reflux for 16 h
3. concentrationThe reaction mixture was concentrated under vacuum