HCID 54136697, compound → HCID 15336052, compound

HRID 440267Notes

Reaction equation

HRID 440267 reaction equation
[S:1]1[CH:5]=[CH:4][N:3]=[C:2]1[CH2:6][N:7]1[C:16]2[C:11](=[CH:12][C:13]([F:19])=[C:14]([F:18])[C:15]=2[F:17])[C:10](=[O:20])[C:9]([C:21]([O:23]CC)=[O:22])=[CH:8]1>S(=O)(=O)(O)O.C(O)(=O)C.O>[S:1]1[CH:5]=[CH:4][N:3]=[C:2]1[CH2:6][N:7]1[C:16]2[C:11](=[CH:12][C:13]([F:19])=[C:14]([F:18])[C:15]=2[F:17])[C:10](=[O:20])[C:9]([C:21]([OH:23])=[O:22])=[CH:8]1

Participants

5

Reactant 1

HCID 54136697HCID 54136697, compound

Product 1

HCID 15336052HCID 15336052, compoundYield 95.3%

Reagents, catalysts & solvents 3

HCID 176Acetic AcidSolventHCID 962WaterSolventHCID 1118Sulfuric AcidSolvent

Procedure

A mixture of 6.0 g of ethyl(2,3,4,5-tetrafluorobenzoyl)acetate, 5.8 g of ethyl orthoformate and 6.3 g of acetic anhydride was refluxed for 2 hours. After distillation under reduced pressure, the residue was dissolved in 50 ml of ethanol. To this solution, 2.8 g of 2-aminomethylthiazole was added, followed by stirring for 2 hours, while ice cooling. The reaction product was added to 100 ml of ice water, and the resulting crystal was collected by filtration and dried. The 8.0 g crystal obtained was dissolved in 50 ml of dimethylformamide, and 2.0 g of 60% oily sodium hydride was added, followed by heating and stirring at 100 to 110° C. for 2 hours. The reaction product was added to 100 ml of ice water and extracted with dichloromethane (100 ml ×3). The extract was washed with water and dried over anhydrous magnesium sulfate, after which the solvent was distilled off under reduced pressure, to yield 5.4 g of ethyl 1-(thiazol-2-yl)methyl-6,7,8-trifluoro-1,4-dihydro-4-oxoquinoline-3-carboxylate. Next, 5.0 g of this ester was dissolved in a mixture of 3 ml of sulfuric acid, 20 ml of acetic acid and 18 ml of water, followed by stirring at 110° to 120° C. for 1.5 hours. The reaction product was added to 100 ml of ice water to cause crystallization. The resulting crystal was collected by filtration, washed with water and dried to yield 4.4 g of the title compound.

Workup

  1. customcrystallization
  2. filtrationThe resulting crystal was collected by filtration
  3. washwashed with water
  4. customdried

Sources & evidence

ORD record
ord-5572a81bdc804fda84f922b5f1791004
Source dataset
uspto-grants-1996_05
Patent number
US05519024

Reaction notes

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