Methyl iodide → 6-(4-Bromo-2-chloro-phenylamino)-7-chloro-3-methyl-3H-benzoimidazole-5-carboxylic acid methyl ester

HRID 32037Notes

Reaction equation

HRID 32037 reaction equation
[CH3:1][O:2][C:3]([C:5]1[C:13]([NH:14][C:15]2[CH:20]=[CH:19][C:18]([Br:21])=[CH:17][C:16]=2[Cl:22])=[C:12]([Cl:23])[C:8]2[N:9]=[CH:10][NH:11][C:7]=2[CH:6]=1)=[O:4].[C:24](=O)([O-])[O-].[K+].[K+].IC>CN(C)C=O.CCOC(C)=O>[CH3:1][O:2][C:3]([C:5]1[C:13]([NH:14][C:15]2[CH:20]=[CH:19][C:18]([Br:21])=[CH:17][C:16]=2[Cl:22])=[C:12]([Cl:23])[C:8]2[N:9]=[CH:10][N:11]([CH3:24])[C:7]=2[CH:6]=1)=[O:4]

Participants

6

Reactant 3

HCID 6328Methyl iodideHCID 11430Potassium CarbonateHCID 688177756-(4-Bromo-2-chloro-phenylamino)-7-chloro-3H-benzoimidazole-5-carboxylic acid methyl ester

Product 1

HCID 688173586-(4-Bromo-2-chloro-phenylamino)-7-chloro-3-methyl-3H-benzoimidazole-5-carboxylic acid methyl ester

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

6-(4-Bromo-2-chloro-phenylamino)-7-chloro-3H-benzoimidazole-5-carboxylic acid methyl ester 10dd (0.141 g, 0.34 mmol), potassium carbonate (0.141 g, 1.02 mmol), and iodomethane (0.063 mL, 1.02 mmol) are dissolved in dimethylformamide (3 mL). After 20 hours, the reaction mixture is diluted with EtOAc and washed with water (3×), potassium carbonate, and brine. The organic layer is dried (Na2SO4) and concentrated to a brown oil. The N3 and N1 alkylated regioisomers are separated by flash chromatography (EtOAc). The recovery of the N3 alkylated regioisomer is 20.4 mg (28%). MS ESI (+) m/z 428, 430 (M+, Br pattern) detected.

Workup

  1. washwashed with water (3×), potassium carbonate, and brine
  2. dry with materialThe organic layer is dried (Na2SO4)
  3. concentrationconcentrated to a brown oil
  4. customare separated by flash chromatography (EtOAc)

Sources & evidence

ORD record
ord-3118999b03074cccb46179a29f66a512
Source dataset
uspto-grants-2008_09
Patent number
US07425637B2

Reaction notes

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