Methyl iodide → Methyl 5-(4-bromo-2-chloroanilino)-4-fluoro-1-methyl-1H-benzimidazole-6-carboxylate

HRID 1767798Notes

Reaction equation

HRID 1767798 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]([F:23])[C:8]2[N:9]=[CH:10][NH:11][C:7]=2[CH:6]=1)=[O:4].IC.[C:26](=O)([O-])[O-].[K+].[K+]>CN(C)C=O.C(OCC)(=O)C>[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]([F:23])[C:8]2[N:9]=[CH:10][N:11]([CH3:26])[C:7]=2[CH:6]=1)=[O:4]

Participants

6

Reactant 3

HCID 6328Methyl iodideHCID 11430Potassium CarbonateHCID 11749905Methyl 6-((4-bromo-2-chlorophenyl)amino)-7-fluoro-1H-benzo[d]imidazole-5-carboxylate

Product 1

HCID 51711455Methyl 5-(4-bromo-2-chloroanilino)-4-fluoro-1-methyl-1H-benzimidazole-6-carboxylateYield 36%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

A solution of 6-(4-bromo-2-chloro-phenylamino)-7-fluoro-3H-benzoimidazole-5-carboxylic acid methyl ester 8b (150 mg, 0.38 mmol), iodomethane (28 μL, 0.45 mmol) and potassium carbonate (78 mg, 0.56 mmol) in dimethylformamide (1.5 mL) is stirred at 75° C. for one hour. The reaction mixture is diluted with ethyl acetate, washed with saturated aqueous potassium carbonate (2×), brine, and dried (Na2SO4). Flash column chromatography (20:1 methylene chloride/ethyl acetate) provides 56 mg (36%) of the more mobile 6-(4-bromo-2-chloro-phenylamino)-7-fluoro-3-methyl-3H-benzoimidazole-5-carboxylic acid methyl ester 9a as a white solid. 19F NMR (376 MHz, CD3OD) −133.5 (s). MS APCI (+) m/z 412, 414 (M+, Br pattern) detected. Also isolated is 54 mg (35%) of 6-(4-bromo-2-chloro-phenylamino)-7-fluoro-1-methyl-1H-benzoimidazole-5-carboxylic acid methyl ester as a white solid. 19F NMR (376 MHz, CD3OD) −139.9 (s). MS APCI (+) m/z 412, 414 (M+, Br pattern) detected.

Workup

  1. washwashed with saturated aqueous potassium carbonate (2×), brine
  2. dry with materialdried (Na2SO4)

Sources & evidence

ORD record
ord-6daecdd5be9b431789b56810fe5c205c
Source dataset
uspto-grants-2007_06
Patent number
US07235537B2

Reaction notes

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