Potassium Carbonate → N-[1-[2-[(2-benzoxazolyl)thio]ethyl]-4-piperidinyl]-1-[(4-fluorophenyl)methyl]-1H-benzimidazol-2-amine

HRID 979937Notes

Reaction equation

HRID 979937 reaction equation
[O:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[SH:10].Cl[CH2:12][CH2:13][N:14]1[CH2:19][CH2:18][CH:17]([NH:20][C:21]2[N:25]([CH2:26][C:27]3[CH:32]=[CH:31][C:30]([F:33])=[CH:29][CH:28]=3)[C:24]3[CH:34]=[CH:35][CH:36]=[CH:37][C:23]=3[N:22]=2)[CH2:16][CH2:15]1.C(=O)([O-])[O-].[K+].[K+]>CC(=O)C>[O:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[S:10][CH2:12][CH2:13][N:14]1[CH2:15][CH2:16][CH:17]([NH:20][C:21]2[N:25]([CH2:26][C:27]3[CH:32]=[CH:31][C:30]([F:33])=[CH:29][CH:28]=3)[C:24]3[CH:34]=[CH:35][CH:36]=[CH:37][C:23]=3[N:22]=2)[CH2:18][CH2:19]1

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 12891727N-[1-(2-chloroethyl)-4-piperidinyl]-1-(4-fluorophenylmethyl)-1H-benzimidazol-2-amineHCID 1784182821,3-benzoxazole-2-thiol

Product 1

HCID 13769723N-[1-[2-[(2-benzoxazolyl)thio]ethyl]-4-piperidinyl]-1-[(4-fluorophenyl)methyl]-1H-benzimidazol-2-amineYield 50%

Reagents, catalysts & solvents 1

HCID 180AcetoneSolvent

Procedure

A mixture of 1.5 parts of 2-benzoxazolethiol, 4.6 parts of N-[1-(2-chloroethyl)-4-piperidinyl]-1-[(4-fluorophenyl)methyl]-1H-benzimidazol-2-amine, 4.2 parts of potassium carbonate and 120 parts of 2-propanone was stirred and refluxed overnight. The reaction mixture was evaporated and the residue was taken up in water. The product was extracted with dichloromethane. The extract was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (96:4 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from acetonitrile, yielding 2.5 parts (50%) of N-[1-[2-[(2-benzoxazolyl)thio]ethyl]-4-piperidinyl]-1-[(4-fluorophenyl)methyl]-1H-benzimidazol-2-amine; mp. 174.2° C. (compound 73).

Workup

  1. temperaturerefluxed overnight
  2. customThe reaction mixture was evaporated
  3. extractionThe product was extracted with dichloromethane
  4. customThe extract was dried
  5. filtrationfiltered
  6. customevaporated
  7. customThe residue was purified by column chromatography over silica gel using
  8. additiona mixture of trichloromethane and methanol (96:4 by volume) as eluent
  9. customThe pure fractions were collected
  10. customthe eluent was evaporated
  11. customThe residue was crystallized from acetonitrile

Sources & evidence

ORD record
ord-3bec5a62b5044873affbe07bb3dfb4b6
Source dataset
uspto-grants-1987_01
Patent number
US04634704

Reaction notes

Loading…