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

HRID 881962Notes

Reaction equation

HRID 881962 reaction equation
[F:1][C:2]([F:20])([F:19])[C:3]([N:5]1[CH2:11][CH:10]([CH3:12])[C:9]2[CH:13]=[CH:14][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:19])[C:3]([N:5]1[CH2:11][CH:10]([CH3:12])[C:9]2[CH:13]=[CH:14][C:15]([OH:17])=[CH:16][C:8]=2[CH2:7][CH2:6]1)=[O:4]

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 22292800HCID 22292800, compound

Product 1

HCID 22292790N-Trifluoroacetyl-7-hydroxy-1-methyl-2,3,4,5-tetrahydro-1H-3benzazepineYield 95.6%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

A solution of N-trifluoroacetyl-7-methoxy-1-methyl-2,3,4,5-tetrahydro-1H-3-benzazepine (0.506 g, 1.76 mmol) in dichloromethane (20 mL) was treated with BBr3 (4.1 mL of a 11.0M solution in CH2Cl2, 4.1 mmol) and stirred overnight while warming to 20 C. The excess BBr3 was quenched with water, and the resulting mixture was 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 0.460 g of a white solid foam. MS calculated for C13H14F3NO2+H: 274, observed: 274.

Workup

  1. temperaturewhile warming to 20 C
  2. customThe excess BBr3 was quenched with water
  3. additionthe resulting mixture was 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-a09ccb2ff48045aeaf245705537a045a
Source dataset
uspto-grants-2015_03
Patent number
US08993750B2

Reaction notes

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