反应详情

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 silica 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.

1. customthe organic layer was taken by separation
2. washThe ethyl acetate layer was washed with an aqueous solution of 5% potassium carbonate, water
3. dry with materialdried over anhydrous sodium sulfate
4. customThe residue obtained by removal of the solvent by distillation
5. customwas purified by use of a basic silica gel chromatography (eluent: dichloroethane/ethyl acetate=9/1)