Potassium Iodide → 1-{3-[3,6-dihydro-4-(1,3-dihydro-2-oxo-2H-benzimidazol-1-yl)-1-(2H)-pyridinyl]propyl}-1,3-dihydro-2H-benzimidazol-2-one

HRID 2420322Notes

Reaction equation

HRID 2420322 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[NH:7][C:6]1=[O:14].[NH:15]1[CH2:20][CH:19]=[C:18]([N:21]2[C:25]3[CH:26]=[CH:27][CH:28]=[CH:29][C:24]=3[NH:23][C:22]2=[O:30])[CH2:17][CH2:16]1.C(=O)([O-])[O-].[Na+].[Na+].[I-].[K+]>O.CC(C)CC(=O)C>[O:14]=[C:6]1[N:5]([C:4]2[CH2:3][CH2:2][N:15]([CH2:16][CH2:17][CH2:18][N:21]3[C:25]4[CH:26]=[CH:27][CH:28]=[CH:29][C:24]=4[NH:23][C:22]3=[O:30])[CH2:20][CH:19]=2)[C:9]2[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=2[NH:7]1

Participants

7

Reactant 4

HCID 4875Potassium IodideHCID 10340Sodium CarbonateHCID 750701,3-dihydro-1-(1,2,3,6-tetrahydro-4-pyridinyl)-2H-benzimidazol-2-oneHCID 18104191-(3-chloropropyl)-1,3-dihydro-2H-benzimidazol-2-one

Product 1

HCID 203856071-{3-[3,6-dihydro-4-(1,3-dihydro-2-oxo-2H-benzimidazol-1-yl)-1-(2H)-pyridinyl]propyl}-1,3-dihydro-2H-benzimidazol-2-oneYield 64.5%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 7909Methyl Isobutyl KetoneSolvent

Procedure

A mixture of 2.3 parts of 1-(3-chloropropyl)-1,3-dihydro-2H-benzimidazol-2-one, 2.15 parts of 1,3-dihydro-1-(1,2,3,6-tetrahydro-4-pyridinyl)-2H-benzimidazol-2-one, 3.2 parts of sodium carbonate, 0.1 parts of potassium iodide and 80 parts of 4-methyl-2-pentanone is stirred and refluxed for 48 hours. After cooling to room temperature, 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 10% of methanol as eluent. The pure fractions are collected and the eluent is evaporated. The residue is crystallized from a mixture of N,N-dimethylformamide and water, yielding 2.5 parts (64.5%) of 1-{3-[3,6-dihydro-4-(1,3-dihydro-2-oxo-2H-benzimidazol-1-yl)-1-(2H)-pyridinyl]propyl}-1,3-dihydro-2H-benzimidazol-2-one; mp. 206.6° C.

Workup

  1. temperaturerefluxed for 48 hours
  2. customthe layers are separated
  3. customThe organic phase is dried
  4. filtrationfiltered
  5. customevaporated
  6. customThe residue is purified by column-chromatography over silica gel using
  7. additiona mixture of trichloromethane and 10% of methanol as eluent
  8. customThe pure fractions are collected
  9. customthe eluent is evaporated
  10. customThe residue is crystallized from a mixture of N,N-dimethylformamide and water

Sources & evidence

ORD record
ord-893ba08bbaeb4856ab61ea6f6ebfb9a8
Source dataset
uspto-grants-1978_08
Patent number
US04110333

Reaction notes

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