Water → 3-(4-trifluoromethylphenyl)-2-propenyl (S)-4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazine-1-carboxylate

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Reaction Steps

To N,N-dimethylformamide (1 ml) solution of 3-(4-trifluoromethylphenyl)-2-propenyl (S)-4-{3-[4-nitro-2-(4-nitrophenylthio)imidazol-1-yl]-2-hydroxy-2-methylpropyl}piperazin-1-carboxylate (100 mg) was added sodium tert-butoxide (19 mg) at 0° C., and stirred at the same temperature for 20 minutes. To the reaction mixture was added water and ethyl acetate, the organic layer was taken by separation. The ethyl acetate layer was washed with an aqueous solution of 5% potassium carbonate, water, and an aqueous solution being saturated with sodium chloride, then dried over anhydrous sodium sulfate. The residue obtained by removal of the solvent by distillation was purified by use of a basic silica gel chromatography (eluent: dichloroethane/ethyl acetate=9/1) and a slica gel column chromatography (eluent: dichloromethane/ethyl acetate/methanol=20/20/1), there was obtained 3-(4-trifluoromethylphenyl)-2-propenyl (S)-4-(2-methyl-6-nitro-2,3-dihydroimidazo-[2,1-b]oxazol-2-ylmethyl)piperazin-1-carboxylate (40 mg, yield: 54%) as yellow amorphous product.

Provenance & Evidence