The present invention relates to a new process for the preparation of cephalosporin derivative of formula (I)
1
wherein R
1
represents p-methoxybenzyl, p-nitrobenzyl, o-chlorobenzyl or diphenylmethyl; R
2
represents CH
3
or CR
a
R
b
COOR
c
where R
a
and R
b
independently represent hydrogen or methyl and R
c
represents hydrogen or (C
1
-C
6
) alkyl; R
3
represents hydrogen, acyl, phenacyl, formyl or trityl group.
本发明涉及一种制备公式(I)1的
头孢菌素衍
生物的新工艺,其中R1代表对
甲氧基苯甲基、对
硝基苯甲基、邻
氯苯甲基或二苯甲基;R2代表
CH3或CRaRbCOORc,其中Ra和Rb独立地代表氢或甲基,Rc代表氢或(C1-C6)烷基;R3代表氢、酰基、
苯乙酰基、甲酰基或三苯甲基基团。