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Potassium Iodide → N-[1-[2-(ethenyloxy)ethyl]-4-piperidinyl]-1-(4-fluorophenylmethyl)-1H-benzimidazol-2-amine

HRID 280338
Notes
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Reaction equation

HRID 280338 reaction equation
Cl[CH2:2][CH2:3][O:4][CH:5]=[CH2:6].Br.Br.[F:9][C:10]1[CH:15]=[CH:14][C:13]([CH2:16][N:17]2[C:21]3[CH:22]=[CH:23][CH:24]=[CH:25][C:20]=3[N:19]=[C:18]2[NH:26][CH:27]2[CH2:32][CH2:31][NH:30][CH2:29][CH2:28]2)=[CH:12][CH:11]=1.C(=O)([O-])[O-].[Na+].[Na+].[I-].[K+]>CN(C)C=O>[CH:5]([O:4][CH2:3][CH2:2][N:30]1[CH2:31][CH2:32][CH:27]([NH:26][C:18]2[N:17]([CH2:16][C:13]3[CH:14]=[CH:15][C:10]([F:9])=[CH:11][CH:12]=3)[C:21]3[CH:22]=[CH:23][CH:24]=[CH:25][C:20]=3[N:19]=2)[CH2:28][CH2:29]1)=[CH2:6]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 4

HCID 4875Potassium IodideHCID 80742-Chloroethyl vinyl etherHCID 10340Sodium CarbonateHCID 3018631Norastemizole hydrobromide

Product 1

HCID 13653865N-[1-[2-(ethenyloxy)ethyl]-4-piperidinyl]-1-(4-fluorophenylmethyl)-1H-benzimidazol-2-amineYield 32%

Reagents, catalysts & solvents 1

HCID 6228
Dimethylformamide
Solvent

Conditions

Temperature
70 °C

Procedure

A mixture of 1.6 parts of 1-chloro-2-(ethenyloxy)ethane, 7.3 parts of 1-(4-fluorophenylmethyl)-N-(4-piperidinyl)-1H-benzimidazol-2-amine dihydrobromide, 3.1 parts of sodium carbonate, 0.1 parts of potassium iodide and 135 parts of N,N-dimethylformamide was stirred and heated overnight at 70° C. The reaction mixture was poured onto water and the product was extracted with 4-methyl-2-pentanone. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol, saturated with ammonia, (96:4 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from acetonitrile, yielding 1.9 parts (32%) of N-[1-[2-(ethenyloxy)ethyl]-4-piperidinyl]-1-(4-fluorophenylmethyl)-1H-benzimidazol-2-amine; mp. 138.5° C. (compound 1).

Workup

  1. additionThe reaction mixture was poured onto water
  2. extractionthe product was extracted with 4-methyl-2-pentanone
  3. customThe extract was dried
  4. filtrationfiltered
  5. customevaporated
  6. customThe residue was purified by column chromatography over silica gel using
  7. additiona mixture of trichloromethane and methanol
  8. customThe pure fractions were collected
  9. customthe eluent was evaporated
  10. customThe residue was crystallized from acetonitrile

Sources & evidence

ORD record
ord-eec8b0d9934e41c8810236d0bc8d8b24
Source dataset
uspto-grants-1986_05
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US04588722

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes