Disclosed herein are novel and inventive methods for preparing intermediates in the synthesis of C3-substituted cephalosporins. One preferred C3-substituted cephalosporin of clinical interest is Cefovecin. Accordingly, the present invention provides for methods of preparing reactive halogen intermediates for use in the synthesis of C3-substituted cephalosporins, such as Cefovecin. In the case of Cefovecin the reactive intermediates are of the formula (I).
本文披露了制备
头孢菌素C3-取代物合成中间体的新颖和创新方法。临床上感兴趣的一种首选C3-取代
头孢菌素是
头孢唑啉。因此,本发明提供了用于制备用于合成C3-取代
头孢菌素(如
头孢唑啉)的反应性卤代中间体的方法。对于
头孢唑啉,反应性中间体的
化学式为(I)。