[Br:1][C:2]1[CH:3]=[C:4]([CH:17]=[CH:18][CH:19]=1)[NH:5][C:6]1[C:7]2[CH:15]=[CH:14][C:13](F)=[N:12][C:8]=2[N:9]=[CH:10][N:11]=1.Cl.CN.C[CH2:24][N:25](CC)CC>CCO>[Br:1][C:2]1[CH:3]=[C:4]([CH:17]=[CH:18][CH:19]=1)[NH:5][C:6]1[C:7]2[CH:15]=[CH:14][C:13]([NH:25][CH3:24])=[N:12][C:8]=2[N:9]=[CH:10][N:11]=1A solution of 4-(3-bromoanilino)-7-fluoropyrido[2,3-d]pyrimidine (see a previous experimental) (0.20 g, 0.63 mmol), methylamine hydrochloride (0.13 g, 1.88 mmol) and Et3N (0.30 mL) 2.19 mmol) in EtOH (15 mL) is heated at 100° C. in a pressure vessel for 18 h. The solvent is removed under reduced pressure, and the residue is partitioned between EtOAc and water. Workup of the organic layer gives 4-(3-bromoanilino)-7-(methylamino)pyrido[2,3-d]pyrimidine (0.16 g, 77%). 1H NMR (DMSO) δ 9.53 (1H, s), 8.54 (1H, s), 8.41 (1H, d, J=8.1 Hz), 8.17 (1H, t, J=1.8 Hz), 7.83 (1H, dd, J=8.0, 1.9 Hz), 7.66 (1H, brs), 7.32 (1H, t, J=8.0 Hz), 7.24 (1H, dd, J=8.0, 1.8 Hz), 6.77 (1H, d, J=8.1 Hz), 2.92 (3H, d, J=4.8 Hz).
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