申请人:SCHERING CORPORATION
公开号:EP0110280A1
公开(公告)日:1984-06-13
Penems of the formula I
in which R is hydrogen or an organic radical, G is hydroxy- loweralkyi and X is hydrogen, a pharmaceutically acceptable salt forming group or a metabolisable ester group, or a protecting group are disclosed.
Process for their preparation involves reacting a compound II
in which R, and R2 are protected carboxy groups and Met is a thiophilic metal with a thiocarbonyl III
in which Y is a leaving group, followed by removal of one of R, and R2 to give a compound of formula I in which R is H together with its thione tautomer. Organic groups R can be introduced into the so-obtained compound by known methods.
Alternatively the compound of formula I in which R is hydrogen can be made by intra-molecular cyclisation of the compound IV.
G, Y and R2 being as previously defined.
Various novel penems are also disclosed as well as three other processes for their preparation.
式 I
其中 R 是氢或有机基,G 是羟基-低级烷基,X 是氢、药学上可接受的成盐基团或可代谢酯基团或保护基团。
其制备工艺包括将化合物 II
其中 R 和 R2 是受保护的羧基,Met 是亲硫金属,与硫代羰基 III 反应
中 Y 为离去基团,然后除去 R 和 R2 中的一个,得到式 I 化合物(其中 R 为 H)及其硫酮同系物。有机基团 R 可以通过已知的方法引入到这样得到的化合物中。
另外,R 为氢的式 I 化合物可通过化合物 IV 的分子内环化反应制得。
G、Y 和 R2 如前定义。
本发明还公开了各种新颖的 Penems 及其制备方法。