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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 1704489
Notes
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Reaction equation

HRID 1704489 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
ParticipantsProcedureWorkupSources & evidenceReaction notes

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-one
Yield 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 is 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
  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-0c2a3b5425054998be70ff645985e681
Source dataset
uspto-grants-1978_11
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US04126687

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes