[F:1][C:2]1[CH:3]=[C:4]([C:8]2[CH:9]=[CH:10][C:11]3[N:12]=[CH:13][N:14]=[C:15]([NH2:18])[C:16]=3[N:17]=2)[CH:5]=[CH:6][CH:7]=1.[H-].[Na+].I[CH:22]([CH3:24])[CH3:23]>CN(C=O)C>[F:1][C:2]1[CH:3]=[C:4]([C:8]2[CH:9]=[CH:10][C:11]3[N:12]=[CH:13][N:14]=[C:15]([NH:18][CH:22]([CH3:24])[CH3:23])[C:16]=3[N:17]=2)[CH:5]=[CH:6][CH:7]=16-(3-fluorophenyl)pyrido[3,2-d]pyrimidin-4-amine 1 (100 mg, 0.42 mmol) in DMF was treated with sodium hydride 60% dispersion in mineral oil (25 mg, 0.63 mmol) followed by 2-iodopropane (0.04 mL, 0.42 mmol), stirred at room temperature for 2 hrs. The reaction mixture was poured on ice, and extracted with EtOAc three times. The combined organic layers were dried with sodium sulfate and concentrated to dry. The crude was purified by ISCO eluting with 100% EtOAc to give pure 6-(3-fluorophenyl)-N-isopropylpyrido[3,2-d]pyrimidin-4-amine 25. LC/MS (ESI+): m/z 283 (M+H). 1H NMR (400 MHz, DMSO) δ 8.53-8.43 (m, 2H), 8.37 (d, J=10.8 Hz, 1H), 8.21 (t, J=8.4 Hz, 2H), 8.15 (d, J=8.8 Hz, 1H), 7.60 (dd, J=14.2, 8.0 Hz, 1H), 7.34 (td, J=8.5, 2.5 Hz, 1H), 4.56 (dq, J=13.3, 6.7 Hz, 1H), 1.35 (d, J=6.6 Hz, 6H).
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