Pyridine → 4-Chloro-2-(quinoxaline-5-sulfonylamino)benzoic acid methyl ester

関与物質

反応手順

A solution of methyl 2-amino-4-chlorobenzoate (0.33 g, 1.8 mmol), quinoxaline-5-sulfonyl chloride (0.40 g, 1.8 mmol), pyridine (0.71 mL, 8.8 mmol), and DCM (10 mL) was stirred at rt for 16 h. EtOAc (75 mL) was added and the solution was washed with satd. aq. NaHCO3 (50 mL), then dried and concentrated. Chromatographic purification of this residue (EtOAc/hexanes) gave the title compound as a white solid (0.60 mg, 90%). MS (ESI+): mass calcd. for C16H12ClN3O4S, 377.0; m/z found, 378 [M+H]+. 1H NMR (400 MHz, CDCl3): 11.44 (s, 1H), 8.97 (d, J=1.8, 1H), 8.95 (d, J=1.8, 1H), 8.61 (dd, J=7.4, 1.4, 1H), 8.33 (dd, J=8.5, 1.4, 1H), 7.89 (dd, J=8.4, 1.0, 1H), 7.84 (d, J=2.0, 1H), 7.77 (d, J=8.6, 1H), 6.89 (dd, J=8.6, 2.0, 1H), 3.90 (s, 3H).

情報源と証拠