Imidazole → 3-(6,7-dimethoxy-2-methyl-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dione

HRID 453060Notes

Reaction equation

HRID 453060 reaction equation
[NH2:1][C:2]1[CH:10]=[C:9]([O:11][CH3:12])[C:8]([O:13][CH3:14])=[CH:7][C:3]=1[C:4]([OH:6])=O.N1[CH:19]=[CH:18]N=C1.C(Cl)(=O)C.Cl.[NH2:25][CH:26]1[CH2:31][CH2:30][C:29](=[O:32])[NH:28][C:27]1=[O:33].P(OC1C=CC=CC=1)(OC1C=CC=CC=1)OC1C=CC=CC=1>C(#N)C.C(=O)([O-])O.[Na+].O>[CH3:14][O:13][C:8]1[CH:7]=[C:3]2[C:2](=[CH:10][C:9]=1[O:11][CH3:12])[N:1]=[C:18]([CH3:19])[N:25]([CH:26]1[CH2:31][CH2:30][C:29](=[O:32])[NH:28][C:27]1=[O:33])[C:4]2=[O:6]

Participants

9

Reactant 5

HCID 795Imidazole2×HCID 6367Acetyl chlorideHCID 7540Triphenyl phosphiteHCID 797364,5-Dimethoxyanthranilic acidHCID 1345483-Aminopiperidine-2,6-dione hydrochloride

Product 1

HCID 252352253-(6,7-dimethoxy-2-methyl-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dioneYield 68.8%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6342AcetonitrileSolventHCID 516892Sodium BicarbonateSolvent

Procedure

To a stirred mixture of 2-amino-4,5-dimethoxybenzoic acid (5.0 g, 25 mmol) and imidazole (2.1 g, 30 mmol) in acetonitrile (50 mL), was added acetyl chloride (2.2 mL, 30 mmol) at room temperature. The mixture was stirred at room temperature overnight. To the mixture, was added 3-amino-piperidine-2,6-dione hydrogen chloride (4.2 g, 25 mmol), imidazole (3.8 g, 56 mmol) and triphenyl phosphite (7.3 mL, 28 mmol) and heated to reflux for 22 hours. The suspension was filtered and washed with acetonitrile (50 mL) and water (2×50 mL) to give a solid. The solid was stirred in sodium hydrogen carbonate (sat, 50 mL), and water (50 mL) for 1 hour. The suspension was filtered and washed with water (2×50 mL) and ethyl acetate (30 mL) to give 3-(6,7-dimethoxy-2-methyl-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dione as a white solid (5.7 g, 68% yield): HPLC: Waters Symmetry C18, 5 μm, 3.9×150 mm, 1 mL/min, 240 nm, 20/80 CH3CN/0.1% H3PO4, 3.26 min (99.8%); mp: 325° C. (decomp); 1H NMR (DMSO-d6) δ 2.15-2.19 (m, 1H, CHH), 2.56-2.88 (m, 6H, CH3, CH2, CHH), 3.85 (s, 3H, CH3), 3.90 (s, 3H, CH3), 5.22 (dd, J=5, 11 Hz, 1H, NCH), 7.09 (s, 1H, Ar), 7.35 (s, 1H, Ar), 10.99 (s, 1H, NH); 13C NMR (DMSO-d6) δ 21.12, 23.21, 30.62, 55.63, 55.97, 56.38, 104.98, 107.31, 113.27, 143.09, 148.40, 153.24, 154.83, 159.76, 169.61, 172.64; LCMS: MH=332; Anal Calcd for C16H17N3O5: C, 58.00; H, 5.17; N, 12.68. Found: C, 57.88; H, 5.06; N, 12.77.

Workup

  1. temperatureheated
  2. temperatureto reflux for 22 hours
  3. filtrationThe suspension was filtered
  4. washwashed with acetonitrile (50 mL) and water (2×50 mL)
  5. customto give a solid
  6. filtrationThe suspension was filtered
  7. washwashed with water (2×50 mL) and ethyl acetate (30 mL)

Sources & evidence

ORD record
ord-9d28ba6ad957440e8824ada63ead0214
Source dataset
uspto-grants-2013_07
Patent number
US08492395B2

Reaction notes

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