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

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl 3-{[3-methoxy-4-(5-methyl-2-phenyl-1,3-oxazol-4-ylmethoxy)benzyl]oxy}-1-phenyl-1H-pyrazole-4-carboxylate (3.00 g), 1N aqueous sodium hydroxide solution (10 mL), tetrahydrofuran (30 mL) and ethanol (30 mL) was stirred at 60° C. for 5 hrs. 1N Hydrochloric acid (10 mL) was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated. The obtained colorless crystals were collected by filtration to give 3-{[3-methoxy-4-(5-methyl-2-phenyl-1,3-oxazol-4-ylmethoxy)benzyl]oxy}-1-phenyl-1H-pyrazole-4-carboxylic acid (2.63 g, yield 92%). The crystals were recrystallized from acetone-hexane. melting point: 209-210° C.

Provenance & Evidence