反应详情

2-mercapto-5-phenyl-1,3,4-oxadiazolyl-(Z)-4-bromo-2-methoxyimino-3-oxo-butyrate (27.0 g) was taken in mixture of THF (250 ml) and water (125 ml). Thiourea (10.6 g) and sodium acetate (2.0 g) were added to this at 10-15° C. after 45 to 60 min. 7-Amino-3-[[(2, 5-dihydro-6-hydroxy-2-methyl-5-oxo-1,2,4-triazin-3yl)thio]methyl]3-cephem-4-carboxylic acid (20.0 g) was suspended in the reaction mixture. The suspension was stirred for 2-3 hours at a pH of 7.0-8.5 maintained by triethylamine to get clear solution. The reaction mixture was monitored by HPLC. After completion of reaction, 200 ml water was added and pH was adjusted to 7.0. The aqueous layer was separated, charcoalized and treated with sodium-2-ethylhexanoate (30.5 g) in acetone, reaction was proceeded by same method as mentioned in Method -I to get crude ceftriaxone sodium (24.0 g).

1. customto get clear solution
2. additionwas added
3. customThe aqueous layer was separated
4. additiontreated with sodium-2-ethylhexanoate (30.5 g) in acetone, reaction