3,4-Dimethoxy-6-nitrobenzamide → 2-Amino-4,5-dimethoxybenzamide

HRID 2298872Notes

Reaction equation

HRID 2298872 reaction equation
[CH3:1][O:2][C:3]1[C:11]([O:12][CH3:13])=[CH:10][C:6]([C:7]([NH2:9])=[O:8])=[C:5]([N+:14]([O-])=O)[CH:4]=1.[BH4-].[Na+]>S([O-])([O-])(=O)=O.[Cu+2]>[CH3:1][O:2][C:3]1[C:11]([O:12][CH3:13])=[CH:10][C:6]([C:7]([NH2:9])=[O:8])=[C:5]([NH2:14])[CH:4]=1

Participants

4

Reactant 2

HCID 27361933,4-Dimethoxy-6-nitrobenzamideHCID 4311764Sodium borohydride

Product 1

HCID 108672362-Amino-4,5-dimethoxybenzamide

Reagents, catalysts & solvents 1

HCID 24462Copper SulfateCatalyst

Procedure

4,5-Dimethoxy-2-nitrobenzoic acid (1) was treated with thionyl chloride and then reacted with ammonia to give 4,5-dimethoxy-2-nitrobenzamide (2) as described by F. Nomoto et al. Chem. Pharm. Bull. 1990, 38, 1591-1595. The nitro group in compound (2) was reduced with sodium borohydride in the presence of copper sulfate (see C. L. Thomas Catalytic Processes and Proven Catalysts Academic Press, New York (1970)) to give 4,5-dimethoxy-2-aminobenzamide (3) which was cyclized by refluxing with formic acid to give 6,7-dimethoxyquinazoline-4(3H)-one (4). Compound (4) was refluxed with phosphorus oxytrichloride to provide compound (5), which is a useful intermediate for preparing compounds of formula I wherein X is NH. Reaction of compound (5) with the requiste aniline provided the following compounds of formula I:

Sources & evidence

ORD record
ord-59b23758ba1c4804baa557cb806fa4c1
Source dataset
uspto-grants-2002_12
Patent number
US06495556B2

Reaction notes

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