Pyridine → N-(2-aminophenyl)-2-methoxy-5-trifluoromethanesulfonylbenzenesulfonamide

Participants

Reaction Steps

To a solution of 2-methoxy-5-trifluoromethanesulfonyl-1-benzenesulfonyl chloride (5 g) in dry dichloromethane (10 mL), benzene-1,2-diamine (5 g) was added followed by addition of dry pyridine (10 mL) at 0° C. The resulting deep red reaction mixture was then stirred at room temperature for 4 h. The reaction mixture was diluted with dichloromethane (250 mL). The contents were washed with saturated aqueous sodium chloride solution (50 mL) and saturated aqueous sodium carbonate solution (50 mL). The organic phase was dried over sodium sulfate and concentrated under vacuum. The residue obtained was purified by flash column chromatography eluting with DCM/EtOAc (7:1 to 4:1) to give N-(2-aminophenyl)-2-methoxy-5-trifluoromethanesulfonylbenzenesulfonamide (6 g). LC: Tr 0.95 min, MS: 411 (M+1)+. 1H NMR (CDCl3, 400 MHz): δ 4.18 (bs, 2H), 4.21 (s, 3H), 6.43 (m, 2H), 6.57 (bs, 1H), 6.75 (dd, 1H), 7.02 (t, 1H), 7.35 (d, 1H), 8.22 (dd, 1H), 8.40 (d, 1H) ppm.

Provenance & Evidence