反应详情

0.41 ml (4.4 mmol) of phosphorous oxychoride was added to 5 ml of ethyl acetate, and 0.35 ml (4.5 mmol) of N,N-dimethylformamide was dropwise added thereto under cooling with ice. Then, the mixture was stirred at room temperature for 15 minutes. To the solution, 20 ml of a methylene chloride solution containing 1.59 g (3.38 mmol) of 2-isopropoxyimino-2-(2-tritylaminothiazol-4-yl)acetic acid (syn-isomer) was added, and the mixture was stirred for 30 minutes. To the reaction solution, 1.4 g (3.37 mmol) of benzhydryl 7-amino-3-chloromethyl-3-cephem-4-carboxylate was added under cooling with ice, and the mixture was stirred for 2 hours. To the reaction solution, 50 ml of ethyl acetate and 20 ml of water were added, and the mixture was adjusted to pH 7.0 with a 5N sodium hydroxide aqueous solution. The organic layer was separated and washed sequentially with a 5% sodium hydrogen carbonate aqueous solution, water and a saturated sodium chloride aqueous solution. The organic layer was dried over anhydrous sodium sulfate and then concentrated under reduced pressure. The oily residue was purified by silica gel column chromatography to obtain 1.94 g (yield: 66%) of benzhydryl 3-chloromethyl-7-[2-isopropoxyimino-2-(2-tritylaminothiazol-4-yl)acetamido]-3-cephem-4-carboxylate (syn-isomer).

1. additionwas dropwise added
2. temperatureunder cooling with ice
3. additionwas added
4. stirringthe mixture was stirred for 30 minutes
5. temperatureunder cooling with ice
6. stirringthe mixture was stirred for 2 hours
7. customThe organic layer was separated
8. washwashed sequentially with a 5% sodium hydrogen carbonate aqueous solution, water
9. dry with materialThe organic layer was dried over anhydrous sodium sulfate
10. concentrationconcentrated under reduced pressure
11. customThe oily residue was purified by silica gel column chromatography