Potassium Iodide → Diphenylmethyl piperazinylbenzimidazole

HRID 354982Notes

Reaction equation

HRID 354982 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.[C:14]1([CH:20]([C:27]2[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=2)[N:21]2[CH2:26][CH2:25][NH:24][CH2:23][CH2:22]2)[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.C(=O)([O-])[O-].[Na+].[Na+].[I-].[K+]>O.CC(C)CC(=O)C>[C:27]1([CH:20]([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[N:21]2[CH2:22][CH2:23][N:24]([CH2:2][CH2:3][CH2:4][N:5]3[C:9]4[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=4[N:7]=[CH:6]3)[CH2:25][CH2:26]2)[CH:28]=[CH:29][CH:30]=[CH:31][CH:32]=1

Participants

7

Reactant 4

HCID 4875Potassium IodideHCID 10340Sodium CarbonateHCID 70048BenzhydrylpiperazineHCID 131055171-(3-Chloropropyl)-1H-benzimidazole

Product 1

HCID 13105518Diphenylmethyl piperazinylbenzimidazole

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 7909Methyl Isobutyl KetoneSolvent

Procedure

A mixture of 4.5 parts of 1-(3-chloropropyl)-1H-benzimidazole, 5.1 parts of 1-(diphenylmethyl)piperazine, 3.7 parts of sodium carbonate, 0.1 parts of potassium iodide and 80 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 purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (95:5 by volume) as eluent. The pure fractions are collected and the eluent is evaporated. The residue is crystallized from a mixture of 4-methyl-2-pentanone and 2,2'-oxybispropane, yielding 1-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-1H-benzimidazole; mp. 132.3° 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 purified by column-chromatography over silica gel using
  8. additiona mixture of trichloromethane and methanol (95:5 by volume) as eluent
  9. customThe pure fractions are collected
  10. customthe eluent is evaporated
  11. customThe residue is crystallized from a mixture of 4-methyl-2-pentanone and 2,2'-oxybispropane

Sources & evidence

ORD record
ord-62dab25b26d34d419add7a4b0cafd543
Source dataset
uspto-grants-1983_03
Patent number
US04377578

Reaction notes

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