Water → ethyl 4-[[1-[2-(4-chlorophenyl)-2-oxoethyl]-1H-benzimidazol-2-yl]amino]-1-piperidinecarboxylate

HRID 490277Notes

Reaction equation

HRID 490277 reaction equation
C([O-])([O-])=O.[K+].[K+].[NH:7]1[C:11]2[CH:12]=[CH:13][CH:14]=[CH:15][C:10]=2[N:9]=[C:8]1[NH:16][CH:17]1[CH2:22][CH2:21][N:20]([C:23]([O:25][CH2:26][CH3:27])=[O:24])[CH2:19][CH2:18]1.Br[CH2:29][C:30]([C:32]1[CH:37]=[CH:36][C:35]([Cl:38])=[CH:34][CH:33]=1)=[O:31].O>C(#N)C>[Cl:38][C:35]1[CH:36]=[CH:37][C:32]([C:30](=[O:31])[CH2:29][N:7]2[C:11]3[CH:12]=[CH:13][CH:14]=[CH:15][C:10]=3[N:9]=[C:8]2[NH:16][CH:17]2[CH2:22][CH2:21][N:20]([C:23]([O:25][CH2:26][CH3:27])=[O:24])[CH2:19][CH2:18]2)=[CH:33][CH:34]=1

Participants

6

Reactant 4

HCID 962WaterHCID 11430Potassium CarbonateHCID 68303p-Chlorophenacyl bromideHCID 30184551-Piperidinecarboxylic acid, 4-(1H-benzimidazol-2-ylamino)-, ethyl ester

Product 1

HCID 22711797ethyl 4-[[1-[2-(4-chlorophenyl)-2-oxoethyl]-1H-benzimidazol-2-yl]amino]-1-piperidinecarboxylateYield 13.1%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

K2CO3 (0.129 mol) was suspended in a solution of ethyl 4-(1H-benzimidazol-2-yl-amino)-1-piperidinecarboxylate (0.0347 mol) and 2-bromo-1-(4-chlorophenyl)ethanone (0.0647 mol) in acetonitrile (150 ml). The mixture was stirred and refluxed for 8 hours, then cooled, poured out into H2O and extracted with CH2Cl2. The organic layer was separated, dried, filtered and the solvent was evaporated. The residue was purified by column chromatography over silica gel (eluent: CH2Cl2/CH3OH/NH4OH 97.5/2.5/0.1). The pure fractions were collected and the solvent was evaporated. Part of this fraction (3 g) was taken up in 2-propanone and diethyl ether. The precipitate was filtered off and dried, yielding 2 g of ethyl 4-[[1-[2-(4-chlorophenyl)-2-oxoethyl]-1H-benzimidazol-2-yl]amino]-1-piperidinecarboxylate (interm. 1).

Workup

  1. temperaturerefluxed for 8 hours
  2. temperaturecooled
  3. extractionextracted with CH2Cl2
  4. customThe organic layer was separated
  5. customdried
  6. filtrationfiltered
  7. customthe solvent was evaporated
  8. customThe residue was purified by column chromatography over silica gel (eluent: CH2Cl2/CH3OH/NH4OH 97.5/2.5/0.1)
  9. customThe pure fractions were collected
  10. customthe solvent was evaporated
  11. filtrationThe precipitate was filtered off
  12. customdried

Sources & evidence

ORD record
ord-596314c3bdb14b7fbcbab293a5dce7be
Source dataset
uspto-grants-2009_05
Patent number
US07528149B2

Reaction notes

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