The present invention more particularly relates to a process for the preparation of cephalosporin antibiotics of the formula (I) wherein R1 represents hydrogen, trityl, CH3, CRaRbCOORYc where Ra and Rb independently represent hydrogen or methyl and Rc represents hydrogen or (C1-C6)alkyl; R2 is carboxylate ion or COORd, where Rd represents hydrogen, ester or a counter ion which forms a salt; R3 represents hydrogen, CH3, CH2OCOCH3, CH=CH2.
本发明更具体地涉及一种制备
头孢菌素抗生素的方法,其中该抗生素的
化学式为(I),其中R1代表氢、三苯甲基、
CH3、CRaRbCOORYc,其中Ra和Rb独立地代表氢或甲基,Rc代表氢或(C1-C6)烷基;R2为
羧酸根离子或COORd,其中Rd代表氢、酯或形成盐的对离子;R3代表氢、 、 OCO 、CH=
CH2。