Process for the preparation of cephem derivatives and intermediates therefor
申请人:Eisai Co., Ltd.
公开号:EP0333154A2
公开(公告)日:1989-09-20
A cephem derivative represented by the following formula:
wherein R₁ means a fluorine-substituted lower alkyl and A₁ denotes a cyclic or acyclic ammonio group, or a non-toxic salt thereof, is prepared by reacting a compound represented by the following formula:
wherein A₁ has the same meaning as defined above, with another compound represented by the following formula:
wherein R₁ has the same meaning as defined above, and if necessary, removing the protecting groups. The cephem compounds can be used for the manufacture of pharmaceutical compositions having antibacterial activity.
Compounds for the preparation of cephem derivatives
申请人:Eisai Co., Ltd.
公开号:EP0612751A2
公开(公告)日:1994-08-31
The invention provides specific compounds being useful for the preparation of cephem derivatives of the following formula:
wherein R₁ means a fluorine-substituted lower alkyl and A₁ denotes a cyclic or acyclic ammonio group, or a non-toxic salt thereof.
These specific compounds are given by the formulae
wherein R₇ means a lower alkyl group, or a salt thereof.
Cephem derivatives and process for the preparation thereof
申请人:Eisai Co., Ltd.
公开号:EP0764648A1
公开(公告)日:1997-03-26
A compound represented by the following formula:
wherein R6 means an amino group or an amino group blocked by a protecting group, and A2 denotes a group represented by the following formula:
a compound obtained by blocking -COO- of the first-mentioned compound with a protecting group, or a salt thereof. The compound can be used as an intermediate for a drug having antibacterial activity.