反应详情

3.29 g of 7-amino-3-[(1-methyl-1H-tetrazol-5-yl)thiomethyl]ceph-3-em-4-carboxylic acid are suspended in 25 ml of dichloromethane and mixed with 2.7 ml of N,O-bis-(trimethylsilyl)acetamide. After 15 minutes, a clear solution is present. This is cooled to -15°, and 3.9 g of 2-(2-aminothiazol-4-yl)-2-oxothioacetic-acid-S-benzothiazol-2-ylester are added. After stirring for four hours at -15°, the preparation is stirred into 100 ml of ethanol, whereby the end product precipitates. This is stirred for one hour at 0°, filtered, washed with ethanol and vacuum dried. Yield: 3.9 g, i.e. 80.7%. M.p.: from 145° (decomp.).

1. temperatureThis is cooled to -15°
2. customprecipitates
3. stirringThis is stirred for one hour at 0°
4. filtrationfiltered
5. washwashed with ethanol and vacuum
6. customdried