反应详情

温度

-30 °C

To a solution of benzhydryl 7-tert-butoxycarbonylamino-3-[2-(2-pyrimidinyl)thiovinyl]-3-cephem-4-carboxylate-1-oxide (trans isomer) (4.8 g) in N,N-dimethylformamide (25 ml) was added phosphorus trichloride (0.8 ml) at -30° C. After being stirred for an hour at -30° C., the reaction mixture was poured into a mixture of ethyl acetate (300 ml) and water (300 ml). The separated organic layer was washed in turn with 5% aqueous solium bicarbonate, water and brine. The solvent was evaporated in vacuo to give benzhydryl 7-tert-butoxycarbonylamino-3-[2-(2-pyrimidinyl)thiovinyl]-3-cephem-4-carboxylate (trans isomer) and it was added with acetnitrile (100 ml) and p-toluene sulfonic acid (3.5 g). The mixture was stirred for 2 hours at 35° C. After removal of the solvent the residue was dissolved in ethyl acetate and 5% aqueous sodium bicarbonate. The separated organic layer was washed in turn with water and bine, dried over magnesium sulfate. The solvent was evaporated in vacuo to give benzhydryl 7-amino-3-[2-(2-pyrimidinyl)thiovinyl]-3-cephem-4-carboxylate (trans isomer) (2.5 g).

1. washThe separated organic layer was washed in turn with 5% aqueous solium bicarbonate, water and brine
2. customThe solvent was evaporated in vacuo