N-bromobutanimide → Methyl 4-(bromomethyl)-3-nitrobenzoate

HRID 1784199Notes

Reaction equation

HRID 1784199 reaction equation
[CH3:1][O:2][C:3](=[O:14])[C:4]1[CH:9]=[CH:8][C:7]([CH3:10])=[C:6]([N+:11]([O-:13])=[O:12])[CH:5]=1.[Br:15]N1C(=O)CCC1=O.N(C1(C#N)CCCCC1)=NC1(C#N)CCCCC1>C(Cl)(Cl)(Cl)Cl>[CH3:1][O:2][C:3](=[O:14])[C:4]1[CH:9]=[CH:8][C:7]([CH2:10][Br:15])=[C:6]([N+:11]([O-:13])=[O:12])[CH:5]=1

Participants

5

Reactant 3

HCID 67184N-bromobutanimideHCID 749781,1'-Azobis(cyclohexanecarbonitrile)HCID 81816Methyl 4-methyl-3-nitrobenzoate

Product 1

HCID 13399987Methyl 4-(bromomethyl)-3-nitrobenzoateYield 61%

Reagents, catalysts & solvents 1

HCID 5943Carbon TetrachlorideSolvent

Procedure

To a solution of 4-methyl-3-nitrobenzoic acid (5.52 g, 30.5 mmol) in MeOH (100 mL) was added 98% sulfuric acid (2 mL) and the resultant mixture was refluxed overnight, then cooled to room temperature. The mixture was concentrated and the residue was dissolved in CH2Cl2 (50 mL) and water (20 mL). Solid Na2CO3 was added until the aqueous phase was basic to litmus paper. The phases were separated and the aqueous phase was extracted with CH2Cl2 (5×20 mL). The combined organic extracts were dried (Na2SO4) and concentrated and provided 5.79 g (97%) of 4-methyl-3-nitrobenzoic acid methyl ester as a white solid. To a solution of 4-methyl-3-nitrobenzoic acid methyl ester (5.01 g, 25.7 mmol) in CCl4 (65 mL) was added N-bromosuccinimide (5.04 g, 28.3 mmol) followed by 1,1′-azobis(cyclohexanecarbonitrile) (1.21 g, 4.96 mmol). The resultant mixture was refluxed for 24 hours then cooled to room temperature, filtered through filter paper, and concentrated. Purification of the crude material by column chromatography on silica gel (9:1:hexanes-EtOAc) provided 4.30 g (61%) of 4-bromomethyl-3-nitrobenzoic acid methyl ester as a yellow oil. 1H NMR (CDCl3) δ 3.98 (s, 3H), 4.85 (s, 2H), 7.67 (d, 1H, J=7.8 Hz), 8.25 (d, 1H, J=7.8, 1.5 Hz), 8.66 (d, 1H, J=1.5 Hz).

Workup

  1. filtrationfiltered
  2. filtrationthrough filter paper
  3. concentrationconcentrated
  4. customPurification of the crude material by column chromatography on silica gel (9:1:hexanes-EtOAc)

Sources & evidence

ORD record
ord-4d5cc9c759a04a9da593bc4c28b37f28
Source dataset
uspto-grants-2009_03
Patent number
US07501518B2

Reaction notes

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