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Prepared according to Procedure C using Intermediate 2f (300 mg, 0.883 mmol), 6-mercaptopurine monohydrate (165 mg, 0.972 mmol), K2CO3 (134 mg, 0.972 mmol), and DMF (4 mL). The crude product was recrystallized from EtOH to provide 341 mg of a pale orange crystalline solid (85%), mp 233.7-234.4° C. (decomposes). 1H NMR (DMSO-d6) δ: 13.58 (br s, 1H); 8.50 (s, 1H); 8.47 (s, 1H); 7.77-7.85 (m, 2H); 7.68 (d, J=8.1 Hz, 2H); 7.65 (d, J=7.7 Hz, 1H); 7.41-7.56 (m, 2H); 4.45 (d, J=1.2 Hz, 2H). 13C NMR (DMSO-d6) ppm:, 158.7, 156.8, 153.8, 151.5, 149.6, 149.5, 143.5, 135.4, 134.1, 133.3, 132.2, 131.6, 131.6, 130.5, 130.2, 128.8, 127.1, 117.6, 32.0. MS (ES): m/z 455.0 (M+). Anal. calcd. for C20H12Cl2N6OS.C2H6O.0.3H2: C, 52.14; H, 3.70; Cl, 13.99; N, 16.58; S, 6.33. Found: C, 52.07; H, 3.37; Cl, 13.40; N, 16.65; S, 6.42.

1. customPrepared
2. customThe crude product was recrystallized from EtOH