Sodium hydride → 4-(7-Chloro-quinazolin-4-ylamino)-piperidine-1-carboxylic acid tert-butyl ester

HRID 2242986Notes

Reaction equation

HRID 2242986 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([NH2:14])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[H-].[Na+].Cl[C:18]1[C:27]2[C:22](=[CH:23][C:24]([Cl:28])=[CH:25][CH:26]=2)[N:21]=[CH:20][N:19]=1>CN(C=O)C>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([NH:14][C:18]2[C:27]3[C:22](=[CH:23][C:24]([Cl:28])=[CH:25][CH:26]=3)[N:21]=[CH:20][N:19]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 2418814,7-DichloroquinazolineHCID 12682914-Amino-1-Boc-piperidine

Product 1

HCID 671473374-(7-Chloro-quinazolin-4-ylamino)-piperidine-1-carboxylic acid tert-butyl esterYield 79%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of 4-amino-piperidine-1-carboxylic acid tert-butyl ester (3.62 g, 18.1 mmol, 1.2 equiv) in dry DMF (20 mL) under Ar was added sodium hydride (0.99 g, 22.7 mmol, 1.5 equiv; 55% free-flowing powder moistened with oil) and the reaction mixture stirred at rt. After 2 h, 4,7-dichloro-quinazoline (3.0 g, 15.1 mmol, 1.0 equiv; commercially available) was added and the mixture heated by microwave irradiation to 140° C. for 30 min. Removal of the solvent under reduced pressure and purification with column chromatography on silica eluting with a gradient of heptane/ethyl acetate (10:1→1:1) afforded 4-(7-chloro-quinazolin-4-ylamino)-piperidine-1-carboxylic acid tert-butyl ester (4.33 g, 79%). 1H NMR (300 MHz, CDCl3): δ 1.42-1.53 (m, 2H), 1.48 (s, 9H), 2.16-2.18 (m, 2H), 2.92-2.98 (m, 2H), 4.17-4.20 (m, 2H), 4.39-4.49 (m, 1H), 5.79 (d, J=8.0 Hz, 1H), 7.40 (dd, J=8.8 Hz, J=2.1 Hz, 1H), 7.71 (d, J=8.8 Hz, 1H), 7.82 (d, J=2.1 Hz, 1H), 8.63 (s, 1H). 13C NMR (75 MHz, CDCl3): δ 28.50, 32.05, 42.89, 48.38, 79.85, 113.29, 122.11, 126.75, 127.89, 138.70, 150.65, 154.78, 156.37, 158.58. MS (ISP): 363.5 [M+H]+.

Workup

  1. additioncommercially available) was added
  2. temperaturethe mixture heated by microwave irradiation to 140° C. for 30 min
  3. customRemoval of the solvent
  4. customunder reduced pressure and purification with column chromatography on silica eluting with a gradient of heptane/ethyl acetate (10:1→1:1)

Sources & evidence

ORD record
ord-b286f97ab87649d193d792393238314a
Source dataset
uspto-grants-2010_03
Patent number
US07674804B2

Reaction notes

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