P-Xylene → N-{3-[(2,6-dichloropyridin-4-yl)amino]quinoxalin-2-yl}-3-nitrobenzenesulfonamide

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A mixture of N-(3-chloroquinoxalin-2-yl)-3-nitrobenzenesulfonamide (1 g), 2,6-dichloropyridin-4-amine (760 mg) and p-xylene (10 mL) was heated at 135° C. with stirring overnight. Upon cooling to room temperature, the mixture was dissolved in dichloromethane, washed with 2 N HCl (2×) and brine, concentrated in vacuo to give a crude product of N-{3-[(2,6-dichloropyridin-4-yl)amino]quinoxalin-2-yl}-3-nitrobenzenesulfonamide. A small portion of this crude product was purified by HPLC to give N-{3-[(2,6-dichloropyridin-4-yl)amino]quinoxalin-2-yl}-3-nitro-benzenesulfonamide. 1H NMR (400 MHz, DMSO) δ 9.71 (s, 1H), 8.90 (s, 1H), 8.50 (d, 2H), 8.8.41 (d, 1H), 8.30 (s, 2H), 7.88-7.78 (m, 27.65 (d, 1H), 7.47-7.37 (m, 2H); MS (EI) m/z for C19H12Cl2N6O4S: 491.1, 493.1 (MH+).

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