反应详情

To a solution of benzhydryl 7-[4-bromoacetoacetamido)-3-methylthiomethyl-3-cephem-4-carboxylate (6.0 g) in tetrahydrofuran (30 ml) was added dropwise a solution of thiourea (0.85 g) and sodium bicarbonate (0.94 g) in tetrahydrofuran (30 ml) and water (24 ml) at 25° C. with stirring, and the stirring was continued at 28° to 30° C. for an hour. The reaction mixture was poured into a mixture of ethyl acetate (100 ml) and water (100 ml), followed by separating out the organic layer, which was washed twice with an aqueous solution of sodium chloride, dried over anhydrous magnesium sulfate and then evaporated to give benzhydryl 7-[2-(2-aminothiazol-4-yl)-acetamido]-3-methylthiomethyl-3-cephem-4-carboxylate (4.0 g).

1. waitthe stirring was continued at 28° to 30° C. for an hour
2. customby separating out the organic layer, which
3. washwas washed twice with an aqueous solution of sodium chloride
4. dry with materialdried over anhydrous magnesium sulfate
5. customevaporated