2-Bromobenzylamine → 4-N-[(2-bromophenyl)methyl]pyrido[4,3-d]pyrimidine-4,7-diamine

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A mixture of 7-amino-4-methylthiopyrido[4,3-d]pyrimidine (225 mg, 1.17 mmol) (described in a previous experimental) and 2-bromobenzylamine (0.84 g, 4.52 mmol) is stirred under N2 at 140° C. for 1 h, and the resulting product chromatographed on silica gel (1-5% EtOH/EtOAc) to give 7-amino-4-(2-bromobenzylamino)pyrido[4,3-d]pyrimidine (175 mg, 45%) as a light brown solid. 1H NMR (DMSO) δ 9.16 (1H, s), 8.85 (1H, t, J=5.7 Hz), 8.24 (1H, s), 7.64 (1H, d, J=7.8 Hz), 7.34 (1H, dd, J=7.7, 7.1 Hz), 7.31 (1H, dd, J=7.7, 2.4 Hz), 7.21 (1H, ddd, J 7.8, 6.9, 2.4 Hz), 6.50 (2H, brs), 6.39 (1H, s), 4.74 (2H, d, J=5.7 Hz).

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