Potassium Iodide → 8-[3-(1H-benzimidazol-1-yl)propyl]-1-phenyl-1,3,8-triazaspiro[4,5]decan-4-one

HRID 46902

Reaction equation

HRID 46902 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([N:20]2[C:24]3([CH2:29][CH2:28][NH:27][CH2:26][CH2:25]3)[C:23](=[O:30])[NH:22][CH2:21]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>[N:5]1([CH2:4][CH2:3][CH2:2][N:27]2[CH2:26][CH2:25][C:24]3([N:20]([C:14]4[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=4)[CH2:21][NH:22][C:23]3=[O:30])[CH2:29][CH2:28]2)[C:9]2[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=2[N:7]=[CH:6]1

Participants

7

Reactant 4

HCID 4875Potassium IodideHCID 10340Sodium CarbonateHCID 705561-Phenyl-1,3,8-triazaspiro(4.5)decan-4-oneHCID 131055171-(3-Chloropropyl)-1H-benzimidazole

Product 1

HCID 203856398-[3-(1H-benzimidazol-1-yl)propyl]-1-phenyl-1,3,8-triazaspiro[4,5]decan-4-oneYield 25%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 7909Methyl Isobutyl KetoneSolvent

Procedure

A mixture of 6 parts of 1-(3-chloropropyl)-1H-benzimidazole, 4.6 parts of 1-phenyl-1,3,8-triazaspiro[4,5]decan-4-one, 10 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 (90:10 by volume) as eluent. The pure fractions are collected and the eluent is evaporated. The residue is crystallized from 4-methyl-2-pentanone, yielding 2parts (25%) of 8-[3-(1H-benzimidazol-1-yl)propyl]-1-phenyl-1,3,8-triazaspiro-[4,5]decan-4-one; mp. 191° 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 (90:10 by volume) as eluent
  9. customThe pure fractions are collected
  10. customthe eluent is evaporated
  11. customThe residue is crystallized from 4-methyl-2-pentanone

Sources & evidence

ORD record
ord-d97cbc76753b4a4eba775885524be3cb
Source dataset
uspto-grants-1979_11
Patent number
US04175129

Linked notes

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