Starting compounds for preparing cephem compounds and processes for their preparation
申请人:FUJISAWA PHARMACEUTICAL CO., LTD.
公开号:EP0009671A2
公开(公告)日:1980-04-16
Compounds of formula (I) are used in the preparation of cephalosporins of formula (II) which are precursors of cephalosporins of formula (III) which show a pharmacological activity:
wherein:
X' = hydrogen or halogen
A1, A2 = acetal residue which may be linked together
R, = aliphatic hydrocarbon group which may have suitable substituents
Y' = carbonyl or protected carbonyl group
R2 = carboxyl or protected carboxyl group
R. = hydroxy, acyloxy or methylene
式(I)化合物用于制备式(II)头孢菌素,而式(II)头孢菌素是具有药理活性的式(III)头孢菌素的前体:
其中
X' = 氢或卤素
A1、A2 = 可连接在一起的缩醛残基
R, = 脂肪族烃基,可带有合适的取代基
Y' = 羰基或受保护的羰基
R2 = 羧基或受保护的羧基
R. = 羟基、酰氧基或亚甲基