反应详情

To a solution of benzhydryl 7-amino-3-mesyloxy-3-cephem-4-carboxylate (6.91 g) and bis(trimethylsilyl)urea (18.4 g) in methylene chloride (69 ml) was added 2-allyloxyimino-2-(5-amino-1,2,4-thiadiazol-3-yl)acetyl chloride hydrochloride (syn isomer) (4.08 g) at -10° C. under stirring and the mixture was stirred at the same temperature for 30 minutes. After the reaction mixture was added to a stirred mixture of water and methylene chloride, the solution was adjusted to pH 7.0 with a saturated aqueous solution of sodium bicarbonate. The separated organic layer was washed with brine, dried over magnesium sulfate and evaporated in vacuo to give benzhydryl 7-[2-allyloxyimino-2-(5-amino-1,2,4-thiadiazol-3-yl)acetamido]-3-mesyloxy-3-cephem-4-carboxylate (syn isomer) (8.90 g).

1. stirringthe mixture was stirred at the same temperature for 30 minutes
2. washThe separated organic layer was washed with brine
3. dry with materialdried over magnesium sulfate
4. customevaporated in vacuo