Phosphine tribromide → 2-[5-(Bromomethyl)thiophen-2-yl]benzonitrile

HRID 1688831Notes

Reaction equation

HRID 1688831 reaction equation
O[CH2:2][C:3]1[S:7][C:6]([C:8]2[CH:15]=[CH:14][CH:13]=[CH:12][C:9]=2[C:10]#[N:11])=[CH:5][CH:4]=1.[Br-:16].[Br-].[Br-].P>C1(C)C=CC=CC=1>[Br:16][CH2:2][C:3]1[S:7][C:6]([C:8]2[CH:15]=[CH:14][CH:13]=[CH:12][C:9]=2[C:10]#[N:11])=[CH:5][CH:4]=1

Participants

4

Reactant 2

HCID 21862892Phosphine tribromideHCID 670088992-[5-(Hydroxymethyl)thiophen-2-yl]benzonitrile

Product 1

HCID 670086562-[5-(Bromomethyl)thiophen-2-yl]benzonitrileYield 121.1%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

To a solution (50 mL) of 2-[5-(hydroxymethyl)thiophen-2-yl]benzonitrile (2.60 g) in toluene was added phosphine tribromide (2.60 g) at room temperature, and the mixture was stirred at room temperature overnight. The reaction mixture was concentrated, and the residue was dissolved in ethyl acetate. The obtained ethyl acetate solution was washed with saturated aqueous sodium hydrogen carbonate and then with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography to give the title compound as a colorless solid (3.20 g, 95%).

Workup

  1. concentrationThe reaction mixture was concentrated
  2. dissolutionthe residue was dissolved in ethyl acetate
  3. washThe obtained ethyl acetate solution was washed with saturated aqueous sodium hydrogen carbonate
  4. dry with materialwith saturated brine, and dried over anhydrous magnesium sulfate
  5. customThe solvent was evaporated under reduced pressure
  6. customthe residue was purified by silica gel column chromatography

Sources & evidence

ORD record
ord-6a8522f67c26466fb72c7edb42edcbb8
Source dataset
uspto-grants-2012_04
Patent number
US08148383B2

Reaction notes

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