反应详情

In tetrahydrofuran (20 ml) is dissolved 2,2,2-trichloroethyl (E)-7-t-butoxycarbonylhydrazono-3-methyl-3-cephem-4-carboxylate (4.60 g), and under ice-cooling, a 1 M tetrahydrofuran solution of borane-tetrahydrofuran complex (23 ml) is added dropwise. The mixture is stirred at that temperature for 30 minutes. The reaction mixture is poured in a mixture of ethyl acetate (150 ml) and aqueous sodium chloride (200 ml). The organic layer is taken, dried over magnesium sulfate and concentrated. The residual oil is subjected to silica gel (50 g) column chromatography and elution is carried out with ethyl acetate-benzene. The above procedure gives crystals of 2,2,2-trichloroethyl 7β-t-butoxycarbonylhydrazino-3-methyl-3-cephem-4-carboxylate (2.49 g).

1. temperatureunder ice-cooling
2. dry with materialdried over magnesium sulfate
3. concentrationconcentrated
4. washThe residual oil is subjected to silica gel (50 g) column chromatography and elution