[OH:1][CH:2]1[CH2:7][CH2:6][N:5]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:4][CH2:3]1.[H-].[Na+].Cl[C:18]1[C:19]2[N:27]=[C:26]([Cl:28])[CH:25]=[CH:24][C:20]=2[N:21]=[CH:22][N:23]=1>CN(C=O)C.O>[Cl:28][C:26]1[CH:25]=[CH:24][C:20]2[N:21]=[CH:22][N:23]=[C:18]([O:1][CH:2]3[CH2:3][CH2:4][N:5]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:6][CH2:7]3)[C:19]=2[N:27]=1
To a solution of tert-butyl 4-hydroxypiperidine-1-carboxylate (0.201 g, 1.000 mmol) in DMF (5.00 ml) was added NaH (0.052 g, 55% dispersion in mineral oil, 1.20 mmol) at 0° C. After stirring for 30 min at room temperature, the reaction mixture was cooled to 0° C. and 4,6-dichloropyrido[3,2-d]pyrimidine (Intermediate 1, step D) (0.2 g, 1.000 mmol) was added to the mixture. After stirring for 3 hours at room temperature, the reaction mixture was diluted with water, and extracted with EtOAc. The organic layers were dried over MgSO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on SiO2 (Hex:EtOAc=5:1) to give tert-butyl 4-(6-chloropyrido[3,2-d]pyrimidin-4-yloxy)piperidine-1-carboxylate (0.236 g, 65%) as a white solid. 1H-NMR (CDCl3, Varian 400 MHz) δ 1.49 (9H, s), 1.91-1.99 (2H, m), 2.10-2.13 (2H, m), 3.21-3.27 (2H, m), 3.83-3.97 (2H, m), 5.55-5.62 (1H, m), 7.74 (1H, d, J=8.8 Hz), 8.19 (1H, d, J=8.8 Hz), 8.41 (1H, s).
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