Triethylamine → 1-Cyclopropyl-6,8-difluoro-7-(4-phenylimidazol-1-yl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid

HRID 2372329Notes

Reaction equation

HRID 2372329 reaction equation
[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:16])=[C:11](F)[C:12]=3[F:14])[C:7](=[O:17])[C:6]([C:18]([OH:20])=[O:19])=[CH:5]2)[CH2:3][CH2:2]1.[C:21]1([C:27]2[N:28]=[CH:29][NH:30][CH:31]=2)[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1.C(N(CC)CC)C>CS(C)=O>[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][C:10]([F:16])=[C:11]([N:30]4[CH:31]=[C:27]([C:21]5[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=5)[N:28]=[CH:29]4)[C:12]=3[F:14])[C:7](=[O:17])[C:6]([C:18]([OH:20])=[O:19])=[CH:5]2)[CH2:2][CH2:3]1

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 5354141-Cyclopropyl-6,7,8-trifluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acidHCID 178418822HCID 178418822, compound

Product 1

HCID 144767161-Cyclopropyl-6,8-difluoro-7-(4-phenylimidazol-1-yl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acidYield 56.5%

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

A mixture of 2.8 g (10 mmol) of 1-cyclopropyl-6,7,8-trifluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid, 4.3 g (30 mmol) of 4-phenylimidazole, 20 ml of triethylamine and 100 ml of DMSO is refluxed for 3 hours. It is allowed to cool, poured into a water/ice mixture and adjusted to pH 5 to give a precipitate, which is filtered off and washed with water. The solid is dried under vacuum to give 2.3 g of 1-cyclopropyl-6,8-difluoro-7-(4-phenylimidazol-1-yl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid melting at 286°-288° C.

Workup

  1. temperatureis refluxed for 3 hours
  2. temperatureto cool
  3. customto give a precipitate, which
  4. filtrationis filtered off
  5. washwashed with water
  6. customThe solid is dried under vacuum

Sources & evidence

ORD record
ord-4444745d19754b2a8b1a313bdf287f73
Source dataset
uspto-grants-1992_03
Patent number
US05098913

Reaction notes

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