3,5-Dimethoxybenzaldehyde → 6-amino-2-(3,5-dimethoxy-phenyl)-3H-quinazolin-4-one

HRID 591863

Reaction equation

[NH2:1][C:2]1[CH:10]=[CH:9][C:8]([N+:11]([O-])=O)=[CH:7][C:3]=1[C:4]([NH2:6])=[O:5].[CH3:14][O:15][C:16]1[CH:17]=[C:18]([CH:21]=[C:22]([O:24][CH3:25])[CH:23]=1)[CH:19]=O.S([O-])(O)=O.[Na+].O.C1(C)C=CC(S(O)(=O)=O)=CC=1.C([O-])(O)=O.[Na+]>CN(C)C(=O)C>[NH2:11][C:8]1[CH:7]=[C:3]2[C:2](=[CH:10][CH:9]=1)[N:1]=[C:19]([C:18]1[CH:21]=[C:22]([O:24][CH3:25])[CH:23]=[C:16]([O:15][CH3:14])[CH:17]=1)[NH:6][C:4]2=[O:5]

Participants

Conditions

Temperature: 150 °C

Procedure

A mixture of 2-amino-5-nitro-benzamide (1.81 g, 10.0 mmol), 3,5-dimethoxy-benzaldehyde (1.83 g, 11.0 mmol), sodium hydrogen sulfite (58.5 wt %, 3.94 g, 22.0 mmol), and p-toluenesulfonic acid monohydrate (0.38 g, 2.00 mmol) in N,N-dimethylacetamide (20 mL) was stirred at 150° C. for 17 hours under nitrogen and then cooled to room temperature. Saturated aqueous NaHCO3 (approximately 1 mL) was added. The mixture was stirred at room temperature for 2 hours, then concentrated to dryness. Water (80 mL) was added, stirred for 0.5 hours, and filtered. The solid was air dried. The crude compound was purified by column chromatography (silica gel 230-400 mesh; ethyl acetate as eluent) to give 6-amino-2-(3,5-dimethoxy-phenyl)-3H-quinazolin-4-one as a yellow solid. Yield: 1.50 g (50%).

Workup

temperaturecooled to room temperature
stirringThe mixture was stirred at room temperature for 2 hours
concentrationconcentrated to dryness
additionWater (80 mL) was added
stirringstirred for 0.5 hours
filtrationfiltered
customdried
customThe crude compound was purified by column chromatography (silica gel 230-400 mesh; ethyl acetate as eluent)

Sources & evidence

ORD record: ord-e939b15943194a47b7530321302338fb
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09238640B2

Linked notes

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