Pyridine → 5,7-Dichloro-1h-indol-2-carboxylic acid [4-(thiazol-2-ylsulfamoyl)-phenyl]-amide

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To a solution of 5,7-dichloro-indole-2-carbonylchloride (186 mg, 0.75 mmol) in pyridine (0.8 mL, 1 mmol) and DCM (5.2 mL) was added N′-(2-thiazolyl)sulfanilamide (128 mg, 0.5 mmol) and the reaction mixture stirred at rt for 16 h. The resulting solid was filtered, washed with DCM (3×5 mL), and dried under vacuum overnight to provide the product (0.21 g; yield=90%) as a white-green solid. 1H-NMR (DMSO-d6) 12.78 (s, 1H), 12.33 (s, 1H), 10.67 (s, 1H), 7.97 (d, J=7.0 Hz, 2H), 7.82 (d, J=7.0 Hz, 2H), 7.62 (d, J=1.5 Hz, 1H), 7.47 (s, 1H), 7.30 (d, J=1.7 Hz, 1H), 7.27 (d, J=4.6 Hz, 1H), 6.84 (d, J=4.6 Hz, 1H). LC/MS (10-99%) M/Z: M+1 obs=467.0; tR=3.12 min.

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