反应详情

温度

0 °C

To a mixture of 7-[(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-[(Z)-1-butenyl]-3-cephem-4-carboxylic acid (300 mg, 0.69 m mole) and K2CO3 (95 mg, 0.69 m mole) in dry DMF (3 ml) was added dropwise at 0° C. a solution of bromomethyl acetate (105 mg, 0.69 m mole) in dry DMF (0.25 ml) and the mixture was stirred at 0° C. for 15 minutes. To the mixture was added again a solution of bromomethyl acetate (105 mg, 0.69 m mole) in dry DMF (0.25 ml). The reaction mixture was stirred for another 30 minutes and diluted with ethyl acetate (20 ml). The dilute was washed with water and a saturated NaCl solution, dried over anhydrous Na2SO4 and evaporated to dryness. The residue was dissolved in methanol and passed through a column of the packing (40 ml) of a PrepPAK cartridge (Waters), which was washed with water and then eluted with 50% methanol. The eluate was monitored by HPLC. The desired fractions were collected and evaporated to give 96 mg (27%) of the title compound. Estimated purity 90% (by HPLC). M.p. 149°-152° C.

1. stirringThe reaction mixture was stirred for another 30 minutes
2. washThe dilute was washed with water
3. dry with materiala saturated NaCl solution, dried over anhydrous Na2SO4
4. customevaporated to dryness
5. dissolutionThe residue was dissolved in methanol
6. washwas washed with water
7. washeluted with 50% methanol
8. customThe desired fractions were collected
9. customevaporated