Ethylene Glycol → 2-(3,4-dichlorophenyl)3H-imidazo[4,5-b]pyridine-3-acetic acid

HRID 2351626Notes

Reaction equation

HRID 2351626 reaction equation
C([O:3][C:4](=[O:24])[CH2:5][NH:6][C:7]1[C:12]([NH:13][C:14](=O)[C:15]2[CH:20]=[CH:19][C:18]([Cl:21])=[C:17]([Cl:22])[CH:16]=2)=[CH:11][CH:10]=[CH:9][N:8]=1)C.C(O)CO.[OH-].[K+]>O>[Cl:22][C:17]1[CH:16]=[C:15]([C:14]2[N:6]([CH2:5][C:4]([OH:3])=[O:24])[C:7]3=[N:8][CH:9]=[CH:10][CH:11]=[C:12]3[N:13]=2)[CH:20]=[CH:19][C:18]=1[Cl:21]

Participants

5

Reactant 3

HCID 174Ethylene GlycolHCID 14797Potassium HydroxideHCID 14390504HCID 14390504, compound

Product 1

HCID 156171932-(3,4-dichlorophenyl)3H-imidazo[4,5-b]pyridine-3-acetic acid

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A mixture of N-[3-[(3,4-dichlorobenzoyl)amino]-2-pyridinyl] glycine ethyl ester (33 g, 0.09 mole) and 167 ml of ethylene glycol was heated at reflux for 11/2 hr. After cooling, potassium hydroxide (8.4 g) in 40 ml of water was added and the reaction mixture was heated at reflux for 1 hr. The solution was filtered to remove yellow insoluble precipitate, the filtrate was diluted with 650 ml of water, and acidified with ethanolic hydrogen chloride. The solid, which formed, was collected by filtration, washed with water, and dried under high vacuum first at 50° C. overnight, then at 70° C. for 21/2 days to give 25.3 g (98%), mp 248°-49° C.

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 11/2 hr
  3. temperatureAfter cooling
  4. temperaturethe reaction mixture was heated
  5. temperatureat reflux for 1 hr
  6. filtrationThe solution was filtered
  7. customto remove yellow insoluble precipitate
  8. additionthe filtrate was diluted with 650 ml of water
  9. customThe solid, which formed
  10. filtrationwas collected by filtration
  11. washwashed with water
  12. customdried under high vacuum first at 50° C. overnight
  13. customat 70° C. for 21/2 days to give 25.3 g (98%), mp 248°-49° C.

Sources & evidence

ORD record
ord-566acb3e4ddd4618ab6db7b40086f5cf
Source dataset
uspto-grants-1989_10
Patent number
US04873251

Reaction notes

Loading…