Hydroxyamine hydrochloride → Methyl 5-(4-bromophenyl)-3-methylisoxazole-4-carboxylate
Reaction equation
[CH3:1][O:2][C:3](=[O:18])[CH:4]([C:9](=[O:17])[C:10]1[CH:15]=[CH:14][C:13]([Br:16])=[CH:12][CH:11]=1)/[C:5](=[N:7]/C)/[CH3:6].Cl.NO>C(O)(=O)C>[CH3:1][O:2][C:3]([C:4]1[C:5]([CH3:6])=[N:7][O:17][C:9]=1[C:10]1[CH:15]=[CH:14][C:13]([Br:16])=[CH:12][CH:11]=1)=[O:18]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 60 °C
Procedure
2-(4-Bromo-benzoyl)-3-[(E)-methylimino]-butyric acid methyl ester (23.81 g, 76.6 mmol) and hydroxylamine hydrochloride (5.32 g, 76.6 mmol) were combined in acetic acid (400 mL) and stirred at 60° C. overnight. After cooling to room temperature, the mixture was concentrated to dryness, and then concentrated twice from toluene (200 mL) to remove residual acetic acid. The residue was partitioned between EtOAc and H2O, and the organic layer was separated and washed twice with H2O. The combined aqueous layers were back-extracted with EtOAc, and the combined organic layers were concentrated. The crude material was filtered through a plug of silica gel, and the filtrate was concentrated to give the title compound.
Workup
- temperatureAfter cooling to room temperature
- concentrationthe mixture was concentrated to dryness
- concentrationconcentrated twice from toluene (200 mL)
- customto remove residual acetic acid
- customThe residue was partitioned between EtOAc and H2O
- customthe organic layer was separated
- washwashed twice with H2O
- extractionThe combined aqueous layers were back-extracted with EtOAc
- concentrationthe combined organic layers were concentrated
- filtrationThe crude material was filtered through a plug of silica gel
- concentrationthe filtrate was concentrated
Sources & evidence
- ORD record
- ord-55f6f133f0a4470a932dd23569f02612
- Source dataset
- uspto-grants-2013_06
- Patent number
- US08455499B2
Reaction notes
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