Boron tribromide → N-Trifluoroacetyl-8-bromo-7-hydroxy-1-methyl-2,3,4,5-tetrahydro-1H-3-benzazepine

HRID 2389405Notes

Reaction equation

HRID 2389405 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]=[C:14]([Br:19])[C:15]([O:17]C)=[CH:16][C:8]=2[CH2:7][CH2:6]1)=[O:4].B(Br)(Br)Br>ClCCl>[F:20][C:2]([F:1])([F:21])[C:3]([N:5]1[CH2:11][CH:10]([CH3:12])[C:9]2[CH:13]=[C:14]([Br:19])[C:15]([OH:17])=[CH:16][C:8]=2[CH2:7][CH2:6]1)=[O:4]

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 22292777HCID 22292777, compound

Product 1

HCID 22292819N-Trifluoroacetyl-8-bromo-7-hydroxy-1-methyl-2,3,4,5-tetrahydro-1H-3-benzazepineYield 86.6%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A solution of N-trifluoroacetyl-8-bromo-7-methoxy-1-methyl-2,3,4,5-tetrahydro-1H-3-benzazepine (1.50 g, 4.10 mmol) in dichloromethane (80 mL) was treated dropwise with BBr3 (9.4 mL of a 1.0M solution in CH2Cl2, 9.4 mmol), and the mixture stirred overnight while warming to 20 C. The excess BBr3 was quenched with the dropwise addition of water, the mixture diluted with ether (200 mL), washed with Na2CO3 (100 mL) and brine (100 mL), dried with Na2SO4 and concentrated. Flash chromatography (15% EtOAc in hexane, silica) resulted in 1.25 g of a white solid foam. 1H NMR (400 MHz, CDCl3, mixture of rotamers) d 7.25 (s, 1H), 6.79 (m, 1H), 3.79 (m, 1H), 3.7-3.3 (m, 2H), 3.2-2.8 (m, 4H), 1.32 (m, 3H).

Workup

  1. temperaturewhile warming to 20 C
  2. customThe excess BBr3 was quenched with the dropwise addition of water
  3. additionthe mixture diluted with ether (200 mL)
  4. washwashed with Na2CO3 (100 mL) and brine (100 mL)
  5. dry with materialdried with Na2SO4
  6. concentrationconcentrated

Sources & evidence

ORD record
ord-cbd740ff10c84d03a7d3e97de93eb953
Source dataset
uspto-grants-2012_09
Patent number
US08273734B1

Reaction notes

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