A round-bottom flask was charged with perfluorophenyl 1-(4-chloro-2-methoxyphenyl)isoquinoline-6-sulfonate (INTERMEDIATE NNN; 102.15 mg, 0.198 mmol), 1,3,4-thiadiazol-2-amine (40.1 mg, 0.396 mmol), cesium carbonate (194 mg, 0.594 mmol), and DMF (1 mL) (1:30 pm). The mixture was diluted with EtOAc and 0.5 N aq. HCl. The layers were separated, and the organic extract was washed with brine, dried over sodium sulfate, filtered, and concentrated. The residue was purified by chromatography on silica gel (12-g Redi-Sep Gold column, 0-7% MeOH/DCM) to give 1-(4-chloro-2-methoxyphenyl)-N-(1,3,4-thiadiazol-2-yl)isoquinoline-6-sulfonamide (64.78 mg, 0.150 mmol, 76% yield) as a white solid. m/z (ESI) 433.0 (M+H)+.
