反应详情

11.5 g of (Z)-2-(2-tritylaminothiazol-4-yl)-2-[((3RS)-2-pyrrolidon-3-yl)oxyimino]acetic acid are suspended in 150 ml of tetrahydrofuran, and 3.2 g of 1-hydroxybenzotriazole and 4.7 g of dicyclohexylcarbodiimide are added thereto under ice-cooling and stirring. The mixture is stirred at room temperature for 2 hours. The mixture is cooled with ice, and 4.9 g of 7β-amino-3-(1-amino-1H-tetrazol-5-yl)thiomethyl-3-cephem-4-carboxylic acid dissolved in a mixture of 50 ml of N,N-dimethylacetamide, 2 ml of water and 3 g of triethylamine are added thereto. The mixture is stirred at 5° to 10° C. for one hour and further at room temperature for 15 hours. The reaction mixture is poured into 750 ml of ice-water, and 250 ml of ethyl acetate are added thereto. The mixture is stirred for 10 minutes and insoluble materials are filtered off. The aqueous layer is collected from the filtrate and is adjusted to pH 3 with 10% hydrochloric acid. The oily material thus obtained is extracted with a mixture of ethyl acetate and tetrahydrofuran (10:3). The extract is washed with water, dried and concentrated under reduced pressure to remove solvent. The residue is triturated with ethyl acetate and thus-precipitated powder is collected by filtration. The powder is dissolved in 100 ml of tetrahydrofuran with heating, and 250 ml of ethyl acetate are added thereto. After cooling, crystalline precipitates are collected by filtration. 4.8 g of 7β-{(Z)-2-tritylaminothiazol-4-yl)- 2-[((3RS)-2-pyrrolidon-3-yl)oxyimino]acetamido}-3-(1-amino-1H-tetrazol-5-yl)thiomethyl-3-cephem-4-carboxylic acid are obtained as colorless crystals.

1. temperatureunder ice-cooling
2. stirringThe mixture is stirred at room temperature for 2 hours
3. additionare added
4. stirringThe mixture is stirred at 5° to 10° C. for one hour and further at room temperature for 15 hours
5. additionare added
6. stirringThe mixture is stirred for 10 minutes
7. filtrationinsoluble materials are filtered off
8. customThe aqueous layer is collected from the filtrate
9. customThe oily material thus obtained
10. extractionis extracted with a mixture of ethyl acetate and tetrahydrofuran (10:3)
11. washThe extract is washed with water
12. customdried
13. concentrationconcentrated under reduced pressure
14. customto remove solvent
15. customThe residue is triturated with ethyl acetate
16. customthus-precipitated powder
17. filtrationis collected by filtration
18. dissolutionThe powder is dissolved in 100 ml of tetrahydrofuran
19. temperaturewith heating
20. addition250 ml of ethyl acetate are added
21. temperatureAfter cooling
22. customcrystalline precipitates
23. filtrationare collected by filtration