Acetic Anhydride → 2-methyl-5-nitro-4H-benzo[d][1,3]oxazin-4-one
Reaction equation
[NH2:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]([N+:11]([O-:13])=[O:12])[C:3]=1[C:4]([OH:6])=[O:5].[C:14](OC(=O)C)(=O)[CH3:15]>>[CH3:14][C:15]1[O:5][C:4](=[O:6])[C:3]2[C:7]([N+:11]([O-:13])=[O:12])=[CH:8][CH:9]=[CH:10][C:2]=2[N:1]=1Participants
Procedure
In certain embodiments, the solvent in step (a) (i.e., reacting 2-amino-6-nitrobenzoic acid with acetic anhydride in a solvent to form 2-methyl-5-nitro-4H-benzo[d][1,3]oxazin-4-one) is petroleum ether, pentane, hexane(s), heptane, octane, isooctane, cyclopentane, cyclohexane, methylcyclohexane, benzene, toluene, xylene, tetralin, cumene, dichloromethane (DCM), 1,2-dichloroethane, 1,1-dichloroethene, 1,2-dichloroethene, chloroform, trichloroethane, trichloroethene, carbon tetrachloride, chlorobenzene, trifluoromethylbenzene, methanol, ethanol, isopropanol (IPA), 1-propanol, 1-butanol, 2-butanol, t-butanol, 3-methyl-1-butanol, 1-pentanol, 2-methoxyethanol, 2-ethoxyethanol, ethyleneglycol, diethyl ether, diisopropyl ether, methyl t-butyl ether (MTBE), diphenyl ether, 1,2-dimethoxyethane, bi(2-methoxyethyl)ether, 1,1-dimethoxymethane, 2,2-dimethoxypropane, anisole, acetone, butanone, methyl ethyl ketone (MEK), methyl isopropyl ketone, methyl butyl ketone, methyl isobutyl ketone (MIBK), methyl acetate, ethyl formate, ethyl acetate, propyl acetate, isopropyl acetate, isobutyl acetate, butyl acetate, ethylene carbonate, propylene carbonate, formamide, N,N-dimethylformamide (DMF), N,N-dimethylacetamide, acetonitrile (ACN), dimethyl sulfoxide (DMSO), sulfolane, nitromethane, nitrobenzene, N-methyl pyrrolindone, 2-methyl tetrahydrofuran, tetrahydrofuran (THF), dioxane, pyridine, formic acid, acetic acid, trichloroacetic acid, trifluoroacetic acid, hexamethylphosphoramide, carbon sulfide, water; or a mixture thereof.
Sources & evidence
- ORD record
- ord-0651a2ecb44c4ece815f1160e4e38bdc
- Source dataset
- uspto-grants-2016_04
- Patent number
- US09303014B2
Reaction notes
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