Sodium hydride → 4-(N-t-butyloxycarbonylmethyloxyethyl-N-methyl-aminocarbonyl)-3-(4-t-butylphenyl)-1-(4-cyanophenyl)-2-methyl-2H-pyrazol-5-one

Participants

Reaction Steps

To a mixture of 200 mg of 3-(4-t-butylphenyl)-1-(4-cyanophenyl)-4-(N-hydroxyethyl-N-methyl-aminocarbonyl)-2-methyl-2H-pyrazol-5-one, 4 ml of tetrahydrofuran and 108 mg of t-butyl bromoacetate, 12.2 mg of sodium hydride was added at 0° C., and the resulting reaction solution was refluxed under heating for 3 days. After the reaction solution was cooled to room temperature, saturated aqueous ammonium chloride was added, and the reaction solution was extracted with chloroform. The extract was washed with 1N hydrochloric acid and saturated aqueous sodium chloride successively and dried over anhydrous sodium sulfate. The insolubles were filtered off, and the filtrate was concentrated. The resulting residue was recrystallized in chloroform-ether-hexane to give 100 mg of the title compound as colorless crystals.

Provenance & Evidence