反应详情

A mixture of 7-[2-(2-formamidothiazol-4-yl)-2-cyanomethoxyiminoacetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 0.8 g.), methanol (12 ml.), conc hydrochloric acid (0.55 g.) and tetrahydrofuran (10 ml.) was stirred at room temperature for 3 hours. After concentrating the resultant solution in vacuo, the residue was dissolved in an aqueous solution of sodium bicarbonate. The solution was adjusted to pH 3.5 with 10% hydrochloric acid and stirred for 30 minutes. The precipitates were collected by filtration, washed with water and dried to give 7-[2-(2-aminothiazol-4-yl)-2-cyanomethoxyiminoacetamido]-3-(1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 0.56 g.).

1. concentrationAfter concentrating the resultant solution in vacuo
2. dissolutionthe residue was dissolved in an aqueous solution of sodium bicarbonate
3. stirringstirred for 30 minutes
4. filtrationThe precipitates were collected by filtration
5. washwashed with water
6. customdried