Hydrochloric Acid → HCID 28068545, compound

Participants

Reaction Steps

To a solution of methyl 2-amino-4-chlorobenzoate (7.0 g, 37.7 mmol) in DCM (75 mL) at room temperature (rt) was added 4-chlorosulfonyl-2,1,3-benzothiadiazole (9.45 g, 39.6 mmol), pyridine (9.1 mL, 112 mmol), and DMAP (0.23 g, 1.88 mmol). The mixture was stirred at rt overnight, poured into 1 N HCl (200 mL), and extracted with DCM (2×100 mL). The combined organic layers were dried (Na2SO4) and concentrated. The crude residue was purified by flash chromatography (hexanes/EtOAc) to afford the title sulfonamide as a tan solid (11.65 g, 80%). MS (ESI−): mass calcd. for C14H10ClN3O4S2, 383.8; m/z found, 382 [M−H]−. 1H NMR (400 MHz, CDCl3): 11.38 (s, 1H), 8.40 (dd, J=7.2, 1.2, 1H), 8.24 (dd, J=8.8, 1.2, 1H), 7.80 (d, J=8.4, 1H), 7.76 (d, J=2.0, 1H), 7.74 (dd, J=8.8, 7.2, 1H), 6.94 (dd, J=8.4, 2.0, 1H), 3.92 (s, 3H). Anal. calcd. for C14H10ClN3O4S2: C, 43.81; H, 2.63; N, 10.95. Found: C, 44.19; H, 3.00; N, 11.23.

Provenance & Evidence