Acetic Acid → 2-(2,4-Dichloro-6-methylphenoxy)-7-(1-ethylpropyl)-1-methyl-4-(pyrrolidin-1-ylmethyl)-1H-benzimidazole

HRID 1698595Notes

Reaction equation

HRID 1698595 reaction equation
[Cl:1][C:2]1[CH:25]=[C:24]([Cl:26])[CH:23]=[C:22]([CH3:27])[C:3]=1[O:4][C:5]1[N:9]([CH3:10])[C:8]2[C:11]([CH:17]([CH2:20][CH3:21])[CH2:18][CH3:19])=[CH:12][CH:13]=[C:14]([CH:15]=O)[C:7]=2[N:6]=1.[NH:28]1[CH2:32][CH2:31][CH2:30][CH2:29]1.C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(=O)(O)[O-].[Na+].C(OCC)(=O)C>[Cl:1][C:2]1[CH:25]=[C:24]([Cl:26])[CH:23]=[C:22]([CH3:27])[C:3]=1[O:4][C:5]1[N:9]([CH3:10])[C:8]2[C:11]([CH:17]([CH2:20][CH3:21])[CH2:18][CH3:19])=[CH:12][CH:13]=[C:14]([CH2:15][N:28]3[CH2:32][CH2:31][CH2:30][CH2:29]3)[C:7]=2[N:6]=1

Participants

7

Reactant 4

HCID 176Acetic AcidHCID 31268PyrrolidineHCID 5049666Sodium triacetoxyborohydrideHCID 580123672-(2,4-Dichloro-6-methylphenoxy)-7-(1-ethylpropyl)-1-methyl-1H-benzimidazole-4-carbaldehyde

Product 1

HCID 580123062-(2,4-Dichloro-6-methylphenoxy)-7-(1-ethylpropyl)-1-methyl-4-(pyrrolidin-1-ylmethyl)-1H-benzimidazoleYield 95.7%

Reagents, catalysts & solvents 2

HCID 8857Ethyl AcetateSolventHCID 516892Sodium BicarbonateSolvent

Procedure

To a mixture of 2-(2,4-dichloro-6-methylphenoxy)-7-(1-ethylpropyl)-1-methyl-1H-benzimidazole-4-carbaldehyde (93 mg, 0.23 mmol), pyrrolidine (33 mg, 0.46 mmol), acetic acid (0.5 ml) and ethyl acetate (1.5 ml) was added sodium triacetoxyborohydride (244 mg, 1.15 mmol) and the reaction mixture was stirred at room temperature for 1 h. The residue was diluted with aqueous saturated sodium bicarbonate and extracted with ethyl acetate. The extracts were washed with water, dried over magnesium sulfate and concentrated in vacuo. The residue was purified by column chromatography on alumina with a 5% ethyl acetate/n-hexane to give 100 mg (0.22 mmol, 94%) of the title compound as a white powder.

Workup

  1. extractionextracted with ethyl acetate
  2. washThe extracts were washed with water
  3. dry with materialdried over magnesium sulfate
  4. concentrationconcentrated in vacuo
  5. customThe residue was purified by column chromatography on alumina with a 5% ethyl acetate/n-hexane

Sources & evidence

ORD record
ord-300106ebfb3c40ed9a40868eac6d6c18
Source dataset
uspto-grants-2012_04
Patent number
US08163935B2

Reaction notes

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