Sodium hydride → Tert-butyl 4-(6-chloropyrido[3,2-d]pyrimidin-4-yloxy)piperidine-1-carboxylate

HRID 1182942Notes

Reaction equation

[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

Participants

Conditions

Temperature: 0 °C

Procedure

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 stiffing 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 stiffing 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).

Workup

waitAfter stiffing for 3 hours at room temperature
extractionextracted with EtOAc
dry with materialThe organic layers were dried over MgSO4
filtrationfiltered
concentrationconcentrated in vacuo
customThe residue was purified by column chromatography on SiO2 (Hex:EtOAc=5:1)

Sources & evidence

ORD record: ord-dbe14cc5e25e4770a9d325bae5008200
Source dataset: uspto-grants-2014_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08664230B2

Reaction notes

Loading…