Ammonia → 1H-benzimidazole-2-carbonitrile

HRID 2259243Notes

Reaction equation

HRID 2259243 reaction equation
Cl[C:2](Cl)(Cl)[C:3]1[NH:4][C:5]2[CH:11]=[CH:10][CH:9]=[CH:8][C:6]=2[N:7]=1.[NH3:14]>C(O)C>[C:2]([C:3]1[NH:4][C:5]2[CH:11]=[CH:10][CH:9]=[CH:8][C:6]=2[N:7]=1)#[N:14]

Participants

4

Reactant 2

HCID 222AmmoniaHCID 77133Benzimidazole, 2-trichloromethyl-2×

Product 1

HCID 8438581H-benzimidazole-2-carbonitrile

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

3.2 Grams of a 2-(trichloromethyl)benzimidazole compound [compound (101)] of the formula (XI) in which X is H and Z is OCF2CFHO was dissolved in 30 ml of ethanol. The resulting solution was added by drops to 4 ml of a 25% aqueous ammonia at 5° C. After stirring for 1 hour at 5° to 15° C., the reaction solution was poured into an ice/conc. hydrochloric acid mixture and extracted with ethyl acetate. The organic layer was washed with water and dried over anhydrous sodium sulfate. Removing the solvent from the dried layer by distillation gave 2.83 g of a 2-cyanobenzimidazole compound [compound (i)] of the formula (II) in which X is H and Z is OCF2CFHO.

Workup

  1. extractionhydrochloric acid mixture and extracted with ethyl acetate
  2. washThe organic layer was washed with water
  3. dry with materialdried over anhydrous sodium sulfate
  4. customRemoving the solvent from the dried layer
  5. distillationby distillation

Sources & evidence

ORD record
ord-6ecc2dd1f82a45e3887beff976d9fe20
Source dataset
uspto-grants-1995_12
Patent number
US05472974

Reaction notes

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