A cephalosporin derivative represented by the formula: ##STR1## wherein R.sub.1 represents a lower alkyl group, and A is selected from: a group of the following formula: ##STR2## where R.sub.2 and R.sub.3 are the same or different lower alkyl group, R.sub.4 represents a substituted lower alkyl or amino group; a group which may be substituted and which is represented by the following formula: ##STR3## where R.sub.5 represents a lower alkyl group; or a group of the following formula: ##STR4## where R.sub.5 is as defined above, R.sub.6 represents a hydroxyl lower alkyl or carboxyl group, or its pharmacologically acceptable salt, and a process for preparing the same, as well as an antibacterial agent containing the same.
High‐content screening of positionalscanninglibraries (PS‐SCLs) represents a promising route for the discovery of biologically relevant compounds. Combined with target identification studies, this strategy successfully enabled the discovery of two pro‐apoptotic compounds from a peptoid PS‐SCL. Despite their high structural similarity, they displayed different mechanisms of action.
The Quantitative Structure-Herbicidal Activity Relationship of 1-Alkyl-1,3,2-Diazaphospholidin-4-Thione-2-Sulfides
作者:Liang-Nian He、Ren-Xi Zhuo、Xiao-Peng Liu、Fei Cai
DOI:10.1080/10426509908546279
日期:1999.1.1
Process for the preparation of cephem derivatives and intermediates
申请人:Eisai Co., Ltd.
公开号:US05128465A1
公开(公告)日:1992-07-07
A cephem derivative represented by the following formula: ##STR1## wherein R.sub.1 means a fluorine-substituted lower alkyl and A.sub.1 denotes a cyclic or acyclic ammonio group, or a non-toxic salt thereof, is prepared by reacting a compound represented by the following formula: ##STR2## wherein A.sub.1 has the same meaning as defined above, with another compound represented by the following formula: ##STR3## wherein R.sub.1 has the same meaning as defined above, and if necessary, removing the protecting groups.