反应详情

A mixture of 2-methyl-6-morpholin-4-ylmethylene-5,6-dihydro-4H-benzothiazol-7-one (200 mg, 7.6 mmol), N-(4-morpholin-4-yl-phenyl)-guanidine nitrate (215 mg, 7.6 mmol), NaOH (30 mg, 7.6 mmol), and 2-methoxyethanol (2 mL) was heated under reflux for 20 h. The reaction mixture was concentrated under vacuum. Flash column chromatography (5% MeOH:CH2Cl2), followed by crystallisation from EtOAc gave the pure title product as dark orange crystals (60 mg, 21%): mp 236-237° C. Anal. RP-HPLC: tR 13.4 min (0-60% MeCN, purity 100%). 1H-NMR (DMSO-d6): δ 9.26 (s, 1H, NH), 8.20 (s, 1H, Py-H), 7.58 (d, 2H, J 9.2, Ph-H), 6.84 (d, 2H, J 9.2, Ph-H), 3.70 (t, 4H, J 4.8, 2×CH2), 2.99 (t, 4H, J 4.8, 2×CH2), 2.90 (m, 4H, CH2—CH2), 2.66 (s, 3H, CH3).

1. temperaturewas heated
2. temperatureunder reflux for 20 h
3. concentrationThe reaction mixture was concentrated under vacuum
4. customFlash column chromatography (5% MeOH:CH2Cl2), followed by crystallisation from EtOAc