[EN] INTERMEDIATES IN THE SYNTHESIS OF C3-SUBSTITUTED CEPHALOSPORINS<br/>[FR] INTERMÉDIAIRES UTILISÉS DANS LA SYNTHÈSE DE CÉPHALOSPORINES SUBSTITUÉES EN C3
申请人:NORBOOK LABORATORIES LTD
公开号:WO2020008183A1
公开(公告)日:2020-01-09
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).