Sodium hydride → 4-benzyl-8-bromo-3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one

HRID 595799Notes

Reaction equation

[CH2:1]([N:8]([CH2:19][CH2:20][OH:21])[C:9](=[O:18])[C:10]1[CH:15]=[CH:14][C:13]([Br:16])=[CH:12][C:11]=1F)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[H-].[Na+]>CN(C=O)C>[CH2:1]([N:8]1[C:9](=[O:18])[C:10]2[CH:15]=[CH:14][C:13]([Br:16])=[CH:12][C:11]=2[O:21][CH2:20][CH2:19]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 90 °C

Procedure

To a solution of N-benzyl-4-bromo-2-fluoro-N-(2-hydroxyethyl)benzamide (494 mg, 1.403 mmol) in DMF (14.00 mL) was added NaH (60% in oil) (61.7 mg, 1.543 mmol) slowly. After H2 gas evolved, the reaction mixture was heated at 90° C. for 24 h. After quenched with water, the reaction mixture was extracted with EtOAc. The organic layer was washed with water and brine. After drying over anhydrous sodium sulfate and filtration, the organic layer was evaporated in vacuo. The oily crude 4-benzyl-8-bromo-3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one was purified by flash chromatography (gradient EtOAc in heptane) in 84% yield. LCMS (m/z): 332.1/334.1 (MH+), 0.94 min.

Workup

customAfter quenched with water
extractionthe reaction mixture was extracted with EtOAc
washThe organic layer was washed with water and brine
dry with materialAfter drying over anhydrous sodium sulfate and filtration
customthe organic layer was evaporated in vacuo
customThe oily crude 4-benzyl-8-bromo-3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one was purified by flash chromatography (gradient EtOAc in heptane) in 84% yield
custom332.1/334.1 (MH+), 0.94 min.

Sources & evidence

ORD record: ord-299e92b45f77453680b7a08f831856ce
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09242996B2

Reaction notes

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