Hydrochloric Acid → 1-benzyl-3-[(3-chloro-4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)oxy]-1H-pyrazole-4-carboxylic acid

Participants

Reaction Steps

To a mixture of ethyl 1-benzyl-3-[(3-chloro-4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)oxy]-1H-pyrazole-4-carboxylate (0.40 g), tetrahydrofuran (3 mL) and ethanol (3 mL) was added 1N aqueous sodium hydroxide solution (3 mL), and the mixture was heated under reflux for 1 hr. The reaction mixture was neutralized by adding 1N hydrochloric acid and water, and the precipitated crystals were collected by filtration to give 1-benzyl-3-[(3-chloro-4-{[2-(2-furyl)-5-methyl-1,3-oxazol-4-yl]methoxy}benzyl)oxy]-1H-pyrazole-4-carboxylic acid as crystals (0.37 g, yield 97%). Recrystallization from ethyl acetate-hexane gave colorless prism crystals. melting point: 191-192° C.

Provenance & Evidence