反应详情

Sodium 5-mercapto-1,2,3-thiadiazole (2.45 g) was suspended in methanol (20 ml), and a solution of p-methoxybenzyl 7-amino-3-chloromethyl-3-cephem-4-carboxylate (5.60 g) in methylene chloride (20 ml) was added dropwise. The mixture was stirred for 30 min. under ice-cooling, an insoluble material was filtered off, and the solvent was evaporated to obtain a crude material (6.38 g). The crude material was subjected to silica gel chromatography eluting with chloroform-ethyl acetate to obtain p-methoxybenzyl 7-amino-3-(1,2,3-thiadiazol-5-yl)thiomethyl-3-cephem-4-carboxylate (4.90 g).

1. temperaturecooling
2. filtrationan insoluble material was filtered off
3. customthe solvent was evaporated
4. customto obtain a crude material (6.38 g)
5. washeluting with chloroform-ethyl acetate