Sodium Acetate → Benzhydryl 7-[2-benzyloxycarbonylmethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-vinyl-3-cephem-4-carboxylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of benzhydryl 7-(2-benzyloxycarbonylmethoxyimino-4-bromo-3-oxobutyramido)-3-vinyl-3-cephem-4-carboxylate (2.5 g) in tetrahydrofuran (25 ml) was added a solution of thiourea (0.78 g) and sodium acetate (0.34 g) in water (10 ml), followed by stirring at 35° C. for 4 hours. The reaction mixture was extracted with ethyl acetate, and the extract was washed with a saturated aqueous sodium chloride and dried over magnesium sulfate. Removal of the solvent gave benzhydryl 7-[2-benzyloxycarbonylmethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-vinyl-3-cephem-4-carboxylate (syn isomer) (2.0 g).

Herkunft & Nachweise