Benzaldehyde → 3-(4-Fluoro-phenyl)-5-((E)-styryl)-isoxazole-4-carboxylic acid

HRID 1962983Notes

Reaction equation

HRID 1962983 reaction equation
C([O:3][C:4]([C:6]1[C:7]([C:12]2[CH:17]=[CH:16][C:15]([F:18])=[CH:14][CH:13]=2)=[N:8][O:9][C:10]=1[CH3:11])=[O:5])C.[CH:19](=O)[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1.[O-]CC.[Na+].Cl>C(O)C>[F:18][C:15]1[CH:14]=[CH:13][C:12]([C:7]2[C:6]([C:4]([OH:3])=[O:5])=[C:10](/[CH:11]=[CH:19]/[C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[O:9][N:8]=2)=[CH:17][CH:16]=1

Participants

6

Reactant 4

HCID 240BenzaldehydeHCID 313Hydrochloric AcidHCID 2723922Sodium ethoxideHCID 22309061Ethyl 3-(4-fluorophenyl)-5-methyl-1,2-oxazole-4-carboxylate

Product 1

HCID 666438363-(4-Fluoro-phenyl)-5-((E)-styryl)-isoxazole-4-carboxylic acidYield 77%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

To a solution of 3-(4-fluoro-phenyl)-5-methyl-isoxazole-4-carboxylic acid ethyl ester (20.0 g, 80.2 mmol) and benzaldehyde (8.19 mL, 80.2 mmol) in ethanol (113 mL) was added sodium ethoxide (2.71M, 32.5 mL, 88.3 mmol) and the reaction mixture was heated under reflux for 1 h. Hydrochloric acid (1 N, 96.3 mL) was added and the resulting mixture was extracted with toluene. The solvent was then distilled off to afford the title compound (19.1 g, 77%) as a light yellow solid. MS: m/e=308.0 [M−H]−.

Workup

  1. temperaturethe reaction mixture was heated
  2. temperatureunder reflux for 1 h
  3. extractionthe resulting mixture was extracted with toluene
  4. distillationThe solvent was then distilled off

Sources & evidence

ORD record
ord-a0a7629332e64b1893f76e6fc6a273a8
Source dataset
uspto-grants-2013_04
Patent number
US08415379B2

Reaction notes

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