Ethyl Acetate → 5-Amino-1-1-butoxycarbonyl-4-methylbenzimidazole

HRID 2260723Notes

Reaction equation

HRID 2260723 reaction equation
[C:1]([O:5][C:6]([N:8]1[C:12]2[CH:13]=[CH:14][C:15]([N+:18]([O-])=O)=[C:16]([CH3:17])[C:11]=2[N:10]=[CH:9]1)=[O:7])([CH3:4])(C)C.[C:21](OCC)(=O)[CH3:22].C([O-])=O.[NH4+]>CO.[Pd]>[NH2:18][C:15]1[CH:14]=[CH:13][C:12]2[N:8]([C:6]([O:5][CH2:1][CH2:4][CH2:21][CH3:22])=[O:7])[CH:9]=[N:10][C:11]=2[C:16]=1[CH3:17]

Participants

6

Reactant 3

HCID 8857Ethyl AcetateHCID 2723923Ammonium formateHCID 158963171h-Benzimidazole-1-carboxylic acid,4-methyl-5-nitro-,1,1-dimethylethyl ester

Product 1

HCID 677887485-Amino-1-1-butoxycarbonyl-4-methylbenzimidazole

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 887MethanolSolvent

Conditions

Temperature
50 °C

Procedure

To a solution of 1-tert-butoxycarbonyl-4-methyl-5-nitrobenzimidazole (8 g) in methanol (40 mL)/ethyl acetate (400 mL) is added palladium-on-carbon (Pd/C) (10%, 0.5 g) and ammonium formate (7.27g). The mixture is stirred at 50° C. for 2 hours, then filtered on Celite, with methanol wash of the solids. The filtrate is rotary evaporated and the residue partitioned between water and ethyl acetate. The organic layer is washed with saturated ammonium chloride, dried over magnesium sulfate, filtered and rotary evaporated to afford pure 5-amino-1-1-butoxycarbonyl-4-methylbenzimidazole as an off-white solid.

Workup

  1. filtrationfiltered on Celite, with methanol
  2. washwash of the solids
  3. customThe filtrate is rotary evaporated
  4. customthe residue partitioned between water and ethyl acetate
  5. washThe organic layer is washed with saturated ammonium chloride
  6. dry with materialdried over magnesium sulfate
  7. filtrationfiltered
  8. customrotary evaporated

Sources & evidence

ORD record
ord-bd7367dff5954afd98f94bebdb299711
Source dataset
uspto-grants-1995_12
Patent number
US05478858

Reaction notes

Loading…