Methyl Isobutyl Ketone → 1-{1-[3-(1H-benzimidazol-1-yl)propyl]-4-piperidinyl}-5-chloro-1,3-dihydro-2H-benzimidazol-2-one

HRID 2420344Notes

Reaction equation

HRID 2420344 reaction equation
Cl[CH2:2][CH2:3][CH2:4][N:5]1[C:9]2[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=2[N:7]=[CH:6]1.[Cl:14][C:15]1[CH:30]=[CH:29][C:18]2[N:19]([CH:23]3[CH2:28][CH2:27][NH:26][CH2:25][CH2:24]3)[C:20](=[O:22])[NH:21][C:17]=2[CH:16]=1.C(=O)([O-])[O-].[Na+].[Na+].CC(C)CC(=O)C>O>[N:5]1([CH2:4][CH2:3][CH2:2][N:26]2[CH2:25][CH2:24][CH:23]([N:19]3[C:18]4[CH:29]=[CH:30][C:15]([Cl:14])=[CH:16][C:17]=4[NH:21][C:20]3=[O:22])[CH2:28][CH2:27]2)[C:9]2[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=2[N:7]=[CH:6]1

Participants

6

Reactant 4

HCID 7909Methyl Isobutyl KetoneHCID 10340Sodium CarbonateHCID 1046075-Chloro-1,3-dihydro-1-(4-piperidinyl)-2H-benzimidazol-2-oneHCID 131055171-(3-Chloropropyl)-1H-benzimidazole

Product 1

HCID 203855791-{1-[3-(1H-benzimidazol-1-yl)propyl]-4-piperidinyl}-5-chloro-1,3-dihydro-2H-benzimidazol-2-oneYield 14%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A mixture of 9 parts of 1-(3-chloropropyl)-1H-benzimidazole, 10 parts of 5-chloro-1,3-dihydro-1-(4-piperidinyl)-2H-benzimidazol-2-one, 7.4 parts of sodium carbonate and 200 parts of 4-methyl-2-pentanone is stirred and refluxed overnight. The reaction mixture is cooled, water is added and the layers are separated. The organic phase is dried, filtered and evaporated. The residue is crystallized from 4-methyl-2-pentanone, yielding 2.9 parts (14%) of 1-{1-[3-(1H-benzimidazol-1-yl)propyl]-4-piperidinyl}-5-chloro-1,3-dihydro-2H-benzimidazol-2-one; mp. 224° C.

Workup

  1. temperaturerefluxed overnight
  2. temperatureThe reaction mixture is cooled
  3. customthe layers are separated
  4. customThe organic phase is dried
  5. filtrationfiltered
  6. customevaporated
  7. customThe residue is crystallized from 4-methyl-2-pentanone

Sources & evidence

ORD record
ord-0af3750f19e14dbdb73f644b654df641
Source dataset
uspto-grants-1978_08
Patent number
US04110333

Reaction notes

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