N-bromobutanimide → N-Trifluoroacetyl-8-bromo-1,4-dimethyl-7-methoxy-2,3,4,5-tetrahydro 1H-3-benzazepine

HRID 1689706Notes

Reaction equation

[F:1][C:2]([F:21])([F:20])[C:3]([N:5]1[CH2:11][CH:10]([CH3:12])[C:9]2[CH:13]=[CH:14][C:15]([O:17][CH3:18])=[CH:16][C:8]=2[CH2:7][CH:6]1[CH3:19])=[O:4].[Br:22]N1C(=O)CCC1=O>C(#N)C.CCOC(C)=O>[F:21][C:2]([F:1])([F:20])[C:3]([N:5]1[CH2:11][CH:10]([CH3:12])[C:9]2[CH:13]=[C:14]([Br:22])[C:15]([O:17][CH3:18])=[CH:16][C:8]=2[CH2:7][CH:6]1[CH3:19])=[O:4]

Participants

Conditions

Temperature: 20 °C

Procedure

A solution N-trifluoroacetyl-1,4-dimethyl-7-methoxy-2,3,4,5-tetrahydro-1H-3-benzazepine (0.452 g, 1.50 mmol) in acetonitrile (20 mL) was treated with N-bromosuccinimide (0.294 g, 1.65 mmol) and stirred overnight at 20° C. The product mixture was diluted with EtOAc (100 mL), washed with sodium bisulfite (50 mL) and brine (50 mL), dried with Na2SO4 and concentrated. Flash chromatography (20% EtOAc in hexane, silica) resulted in a clear oil. 1H NMR (400 MHz, CDCl3, mixture of rotamers) δ 7.32 (s, 1H), 6.62 (m, 1H), 4.37 (m, 1H), 3.87 (s, 3H), 3.81 (m, 1H), 3.28-3.10 (m, 3H), 2.73 (m, 1H), 1.31 (m, 3H), 1.25 (m, 3H).

Workup

washwashed with sodium bisulfite (50 mL) and brine (50 mL)
dry with materialdried with Na2SO4
concentrationconcentrated
customFlash chromatography (20% EtOAc in hexane, silica) resulted in a clear oil

Sources & evidence

ORD record: ord-7ca746e4e6fc45a5936fc70213330726
Source dataset: uspto-grants-2012_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08153621B2

Reaction notes

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