title: Functionalization of C  6(7)  of penicillins and cephalosporins. A one-step stereoselective synthesis of 7- -methoxycephalosporin C.
mesh_terms: D002511:Cephalosporins / Q000138:chemical synthesis*; D008745:Methylation; D010406:Penicillins; D013329:Structure-Activity Relationship
chemical_list: D002511:Cephalosporins; D010406:Penicillins