反应详情

温度

-78 °C

To a solution of 4-acetylthiomethylthio-1,2,3-triazole (230 mg : 1.22 mMol.) in dimethylformamide (6 ml) is dropwise added a 1.26N-sodium methoxide in methanol (1.9 ml) at -60° C., and the mixture is stirred at the same temperature for 25 minutes, and cooled to -78° C. To the reaction mixture is dropwise added a solution of 7β-[(Z)-2-(2-t-butoxycarbonylaminothiazol -4-yl)-2-(2-propenyloxyimino)acetamido]-3 methanesulfonyloxy-3-cephem-4-carboxylic acid diphenylmethyl ester (770 mg : 1 mMol.) in dimethylformamide (3 ml), and the mixture is stirred at the same temperature for 40 minutes. The reaction mixture is diluted with 1N-hydrochloric acid (2 ml) and water (50 ml), and extracted with ethyl acetate. The extract is washed with water, dried over sodium sulfate, and purified by silica gel chromatography (toluene : ethyl acetate=2:1). The eluted material is crystallized from toluene to give 7β-](Z)-2-(2-t-butoxycarbonylaminothiazol-4-yl) 2-(2propentyloxyimino)acetamido]-3-(1,2,3-triazol-4-ylthiomethylthio) -3-cephem-4- carboxylic acid diphenylmethyl ester (415 mg) as colorless crystals. Yield : 51%. mp. 167° to 170° C. (decomposition).

1. stirringthe mixture is stirred at the same temperature for 40 minutes
2. extractionextracted with ethyl acetate
3. washThe extract is washed with water
4. dry with materialdried over sodium sulfate
5. custompurified by silica gel chromatography (toluene : ethyl acetate=2:1)
6. customThe eluted material is crystallized from toluene