反应详情

In 100 ml of water was suspended 4.6 g of 7-amino-3-[(2-hydroxymethyl-5-methyl-s-triazolo[1,5-a]pyrimidin7-yl)thiomethyl]-3-cephem-4-carboxylic acid obtained in Example 2, and a 2N aqueous sodium hydroxide solution was added to the suspension and the mixture was dissolved at a pH 7. To this solution was while stirring under ice-cooling added dropwise a solution of 1.93 g of 2-thienyl acetyl chloride in 20 ml of ether over one hour. During this time, a pH of the mixture was maintained to 7 to 7.5 by addition of a 2N aqueous sodium hydroxide. After stirring for further one hour, the reaction mixture was washed with ethyl acetate. The reaction mixture was adjusted to pH 2.5 with a 2N hydrochloric acid under ice-cooling and stirring, and precipitated crystals were collected by filtration, washed with water and dried to obtain 4.81 g of the title compound.

1. dissolutionthe mixture was dissolved at a pH 7
2. temperaturecooling
3. stirringAfter stirring for further one hour
4. washthe reaction mixture was washed with ethyl acetate
5. temperaturecooling
6. stirringstirring
7. customprecipitated crystals
8. filtrationwere collected by filtration
9. washwashed with water
10. customdried