N-bromobutanimide → Methyl 2-(bromomethyl)-4-chlorobenzoate

HRID 1014017Notes

Reaction equation

HRID 1014017 reaction equation
[Br:1]N1C(=O)CCC1=O.[Cl:9][C:10]1[CH:19]=[CH:18][C:13]([C:14]([O:16][CH3:17])=[O:15])=[C:12]([CH3:20])[CH:11]=1.C(=O)([O-])O.[Na+]>C(OC(C)(C)C)(=O)C.N(C(C)(C)C#N)=NC(C)(C)C#N>[Cl:9][C:10]1[CH:19]=[CH:18][C:13]([C:14]([O:16][CH3:17])=[O:15])=[C:12]([CH2:20][Br:1])[CH:11]=1

Participants

6

Reactant 3

HCID 67184N-bromobutanimideHCID 516892Sodium BicarbonateHCID 22349978Methyl 4-Chloro-2-methylbenzoate

Product 1

HCID 20814722Methyl 2-(bromomethyl)-4-chlorobenzoateYield 83.9%

Reagents, catalysts & solvents 2

HCID 6547AzobisisobutyronitrileCatalystHCID 10908tert-Butyl acetateSolvent

Procedure

(Step 2) A solution of N-bromosuccinimide (6.33 g), 2,2′-azobis(isobutyronitrile) (0.27 g) and methyl 4-chloro-2-methylbenzoate obtained in Step 1 (5.05 g) in t-butyl acetate (80 ml) was stirred overnight at 90° C. The mixture was allowed to cool to room temperature, poured into aqueous sodium hydrogen carbonate solution, and extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over magnesium sulfate, and filtered. The solvent was evaporated under reduced pressure. The residue was purified by silica gel chromatography (ethyl acetate:hexane=0:1-3:17) to give methyl 4-chloro-2-bromomethylbenzoate (6.05 g) as a white solid.

Workup

  1. extractionextracted with ethyl acetate
  2. washThe organic layer was washed with saturated brine
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. customThe solvent was evaporated under reduced pressure
  6. customThe residue was purified by silica gel chromatography (ethyl acetate:hexane=0:1-3:17)

Sources & evidence

ORD record
ord-3a168392ce894dce9778f4250e25025d
Source dataset
uspto-grants-2011_07
Patent number
US07982044B2

Reaction notes

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