反应详情

To a solution of 3-aminobenzenesulfonamide (4.5 g, 26.43 mmol) and pyridine (12.83 mL, 158.6 mmol) in dichloromethane (48 mL) at 0° C. was added 3-chloroquinoxaline-2-carbonyl chloride (6.0 g, 26.43 mmol) in dichloromethane (60 mL) and the mixture was stirred and allowed to warm up to room temperature overnight. To the reaction slurry, water (60 mL) was added. The solid was isolated by filtration, washed with water (3×50 mL), hexane (50 mL) and a small amount of dichloromethane. The solid was dried under vacuum to yield 3-chloro-N-(3-sulfamoylphenyl)quinoxaline-2-carboxamide (7.1 g, 74%) as a salmon colored solid. ESI-MS m/z calc. 362.02, found 363.3 (M+1)+; Retention time: 1.43 minutes (3 minutes run). 1H NMR (400 MHz, DMSO-d6) δ 11.30 (s, 1H), 8.40-8.33 (m, 1H), 8.31-8.24 (m, 1H), 8.24-8.14 (m, 1H), 8.12-7.98 (m, 2H), 7.90-7.81 (m, 1H), 7.69-7.58 (m, 2H), 7.47 (s, 2H) ppm.

1. customThe solid was isolated by filtration
2. washwashed with water (3×50 mL), hexane (50 mL)
3. customThe solid was dried under vacuum