“…The resulting dark brown oil was purified by flash column chromatography (silica gel/1:1 CH 2 Cl 2 /petroleum ether) to afford the title compound as a yellow oil (0.376 g, 26%): 1 H NMR (400 MHz, CDCl 3 ) δ 9.85 (t, J = 0.9 Hz, 1H), 8.15 (dd, J = 8.0, 1.6 Hz, 1H), 7.63 (td, J = 7.5, 1.4 Hz, 1H), 7.53−7.48 (m, 1H), 7.33 (dd, J = 7.6, 1.5 Hz, 1H), 4.12 (br s, 2H). 49 2-(Methanesulfonyl)benzenesulfonamide (12). Aqueous ammonia (35% solution, 1.2 mL) was added all at once to a stirred suspension of 2-(methanesulfonyl)benzenesulfonyl chloride (0.247 g, 0.970 mmol) in diethyl ether (30 mL) at 3 °C in an ice bath.…”