Hydrochloric Acid → 7-Bromo-8-hydroxymethyl-3,3-dimethyl-3,4-dihydro-1H-quinoxalin-2-one
Reaction equation
[H-].[Al+3].[Li+].[H-].[H-].[H-].[Br:7][C:8]1[C:17]([C:18](OC)=[O:19])=[C:16]2[C:11]([NH:12][C:13]([CH3:24])([CH3:23])[C:14](=[O:22])[NH:15]2)=[CH:10][CH:9]=1.C(OCC)(=O)C.Cl>O1CCCC1.O>[Br:7][C:8]1[C:17]([CH2:18][OH:19])=[C:16]2[C:11]([NH:12][C:13]([CH3:24])([CH3:23])[C:14](=[O:22])[NH:15]2)=[CH:10][CH:9]=1Participants
Reactant 4
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- 0 °C
Procedure
Lithium aluminium hydride (38.5 mg, 1.01 mmol) was suspended in anhydrous tetrahydrofuran (0.5 mL) under nitrogen atmosphere. An anhydrous tetrahydrofuran solution (1.5 mL) of 7-bromo-8-methoxycarbonyl-3,3-dimethyl-3,4-dihydro-1H-quinoxalin-2-one (Reference Compound No. 1, 101 mg, 0.323 mmol) was added dropwise thereto at 0° C., and stirred for 1 hour at the same temperature. Ethyl acetate (10 mL), water (10 mL), and 1N aqueous hydrochloride solution (2 mL) were added thereto successively and the mixture was partitioned. The organic layer was washed with saturated brine (10 mL), dried over anhydrous magnesium sulfate, and then the solvent was removed under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate) to give the titled reference compound (67.4 mg) as an orange amorphous product. (Yield 74%)
Workup
- customsuccessively and the mixture was partitioned
- washThe organic layer was washed with saturated brine (10 mL)
- dry with materialdried over anhydrous magnesium sulfate
- customthe solvent was removed under reduced pressure
- customThe obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate)
Sources & evidence
- ORD record
- ord-c5e9a23231bc449bb1e3207edcfe835f
- Source dataset
- uspto-grants-2015_03
- Patent number
- US08975256B2
Reaction notes
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