Phosphorus oxychloride → Methyl 2-chloro-1-[(2'-cyanobiphenyl-4-yl)methyl]benzimidazole-7-carboxylate

HRID 1977380Notes

Reaction equation

HRID 1977380 reaction equation
[C:1]([C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[C:9]1[CH:14]=[CH:13][C:12]([CH2:15][N:16]2[C:20]3[C:21]([C:25]([O:27][CH3:28])=[O:26])=[CH:22][CH:23]=[CH:24][C:19]=3[NH:18][C:17]2=O)=[CH:11][CH:10]=1)#[N:2].P(Cl)(Cl)([Cl:32])=O>>[Cl:32][C:17]1[N:16]([CH2:15][C:12]2[CH:13]=[CH:14][C:9]([C:4]3[CH:5]=[CH:6][CH:7]=[CH:8][C:3]=3[C:1]#[N:2])=[CH:10][CH:11]=2)[C:20]2[C:21]([C:25]([O:27][CH3:28])=[O:26])=[CH:22][CH:23]=[CH:24][C:19]=2[N:18]=1

Participants

3

Reactant 2

HCID 24813Phosphorus oxychlorideHCID 15654691Methyl 3-((2'-cyano-[1,1'-biphenyl]-4-yl)methyl)-2-oxo-2,3-dihydro-1H-benzo[d]imidazole-4-carboxylate

Product 1

HCID 15654692Methyl 2-chloro-1-[(2'-cyanobiphenyl-4-yl)methyl]benzimidazole-7-carboxylateYield 28%

Procedure

A mixture of methyl 1-[(2′-cyanobiphenyl-4-yl)methyl]-2-oxo-2,3-dihydrobenzimidazole-7-carboxylate (8.02 g) in phosphorus oxychloride (30 ml) was heated under reflux for 8 hours. The reaction mixture was concentrated and the resulting residue wag poured into ice-water. The mixture was extracted with chloroform. The extract was washed with water, dried and evaporated. The residue was purified by column chromatography on silica gel to give crystals, which were recrystallized from chloroform-methanol to afford colorless needles (2.2 g, 28%), m.p. 154-157° C.

Workup

  1. temperaturewas heated
  2. temperatureunder reflux for 8 hours
  3. concentrationThe reaction mixture was concentrated
  4. additionthe resulting residue wag poured into ice-water
  5. extractionThe mixture was extracted with chloroform
  6. washThe extract was washed with water
  7. customdried
  8. customevaporated
  9. customThe residue was purified by column chromatography on silica gel
  10. customto give crystals, which
  11. customwere recrystallized from chloroform-methanol

Sources & evidence

ORD record
ord-59ac6b74bef741f6b2ac84da6bc7b5e5
Source dataset
uspto-grants-2001_05
Patent number
US06232334B1

Reaction notes

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