反应详情

To a stirred solution of diphenylmethyl 7-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetamido]-3-(3-iodo-1-propen-1-yl)-3-cephem-4-carboxylate (IX-1) (E, 716 mg, 1 mmole) in dry DMSO (2 ml) was added isonicotinamide (244 mg, 2 mmoles). The mixture was stirred at room temperature for 1 hour and then poured into ethyl acetate (200 ml). The resulting precipitate was collected by filtration, washed well with ethyl acetate and dried. A stirred mixture of the quaternized material (400 mg) and sodium bisulfite (40 mg) in HCOOH (4 ml) was heated at 40°-50° C. for 1 hour, and evaporated to dryness under reduced pressure. The crude solid was dissolved in water (40 ml). After filtration of an insoluble material, the filtrate was chromatographed on a reverse phase column (packing of PrepPAK/C18, 100 ml) using water and 5%, 10%, 20% and 30% aqueous CH3OH as eluant. The fractions containing the desired compound were combined, evaporated and lyophilized to give 21 mg (3.8%) of the title compound (I-1H) (E) as a pale yellow powder. Mp. >180° C. (dec.).

1. filtrationThe resulting precipitate was collected by filtration
2. washwashed well with ethyl acetate
3. customdried
4. additionA stirred mixture of the quaternized material (400 mg) and sodium bisulfite (40 mg) in HCOOH (4 ml)
5. temperaturewas heated at 40°-50° C. for 1 hour
6. customevaporated to dryness under reduced pressure
7. dissolutionThe crude solid was dissolved in water (40 ml)
8. filtrationAfter filtration of an insoluble material
9. customthe filtrate was chromatographed on a reverse phase column (packing of PrepPAK/C18, 100 ml)
10. additionThe fractions containing the desired compound
11. customevaporated