Process for the preparation of cephalosporin intermediate and its use for the manufacture of cephalosporin compounds
申请人:Orchid Chemicals and Pharmaceuticals Limited
公开号:US20030199712A1
公开(公告)日:2003-10-23
The present invention relates to a process for the preparation of 4-halogeno-2-substitutedimino-3-oxo-butyric acid of formula (I)
1
wherein R
1
represents CH
3
, 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, X represents halogen such as chlorine or bromine, also discloses the activation of this acid and its further use in the preparation of cephalosporanic antibiotics (II) in excellent yields and purity
本发明涉及一种制备式(I)的4-卤代-2-取代亚胺-3-氧代丁酸的方法,其中R1代表CH3,CRaRbCOORc,其中Ra和Rb独立地代表氢或甲基,Rc代表氢或(C1-C6)烷基,X代表卤素如氯或溴,同时还揭示了该酸的活化以及其在制备头孢菌素类抗生素(II)中的进一步应用,产率高,纯度高。