Water → 8-Bromo-2,3,4,5-tetrahydro-1H-benzo[b]azepine

To a solution of 8-bromo-1,3,4,5-tetrahydro-2H-1-benzazepin-2-one (500 mg, 2.082 mmol) in THF (20 mL) at RT was added borane-THF complex (1M solution in THF) (5.206 mL, 5.21 mmol). The reaction mixture was refluxed for 3 hours, after which the reaction mixture was cooled in an ice bath before the addition of a further amount of borane-THF complex (1M solution in THF) (7.290 mL, 7.29 mmol). The reaction mixture was once again refluxed overnight. The reaction mixture was cooled in an ice bath before the dropwise addition of water. The aqueous layer was then extracted with diethyl ether (3×25 mL). The organic layers were combined, passed through a hydrophobic frit and concentrated. This residue was purified on silica column eluting with ethyl acetate in cyclohexane (0-15%) to afford the title compound (400 mg). LCMS (A): m/z (M+H)+ 226/228, C10H12BrN requires 225/227 (acidic).

1. temperatureThe reaction mixture was refluxed for 3 hours
2. extractionThe aqueous layer was then extracted with diethyl ether (3×25 mL)
3. concentrationconcentrated
4. customThis residue was purified on silica column
5. washeluting with ethyl acetate in cyclohexane (0-15%)

ORD record

ord-eae2ad3fab4b44ddbc40482ddd3a1a00

Source dataset

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08877742B2