反应详情

To a suspension of 7β-amino-3-(1,2,3-triazol-4-yl)thiomethylthio-3-cephem-4-carboxylic acid diphenylmethyl ester hydrochloride (110 mg: 0.2 mMol.) and (Z)-2-(2-t-butoxycarbonylaminothiazol-4-yl)-2-trityloxyiminoacetic acid (122 mg: 0.23 mMol.) in dichloromethane (3 ml) are added N-methylmorpholine (72 μl: 0.66 mMol.) and phenyl dichlorophosphate (33 μl: 0.22 mMol.) at -30° C. After stirring for 2 hours, the reaction mixture is diluted with 10% hydrochloric acid and extracted with ethyl acetate. The extract is washed with water, dried, purified by silica gel chromatography, and crystallized from toluene to give 7β-[(Z)-2-(2-t-butoxycarbonylaminothiazol-4-yl)-2-trityloxyiminoacetamido]-3-(1,2,3-triazol-4-yl)thiomethylthio-3-cephem-4-carboxylic acid diphenylmethyl ester (110 mg). m.p. 190°-200° C. (decomp.).

1. extractionextracted with ethyl acetate
2. washThe extract is washed with water
3. customdried
4. custompurified by silica gel chromatography
5. customcrystallized from toluene