申请人:Sankyo Company Limited
公开号:US04094982A1
公开(公告)日:1978-06-13
Pyridine derivatives having the formula ##STR1## wherein R.sub.1 represents hydrogen atom, amino group or a group ##STR2## in which R.sub.5 and R.sub.6 may be the same or different and each represents an alkyl group of 1 to 4 carbon atoms or R.sub.5 is hydrogen atom and R.sub.6 represents an alkyl group of 1 to 4 carbon atoms, an alkenyl group of 3 or 4 carbon atoms or a benzyl group optionally substituted with halogen, cyano, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms; R.sub.2 represents nitro group, amino group or an alkylamino group of 1 to 3 carbon atoms; R.sub.3 and R.sub.4 individually represent hydrogen atom, an alkyl group of 1 to 4 carbon atoms, an alkoxyalkyl group which has 1 to 4 carbon atoms in the alkoxy moiety and 2 to 4 carbon atoms in the alkyl moiety, an alkenyl group of 3 or 4 carbon atoms, an alkanoyl group of 1 to 18 carbon atoms or a benzyl group optionally substituted with halogen, cyano, alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms; provided that when R.sub.1 is hydrogen atom and R.sub.2 is nitro group, R.sub.3 and R.sub.4 may be the same or different and each represents said alkyl group or said alkoxyalkyl group or R.sub.3 is hydrogen atom and R.sub.4 is hydrogen atom, said alkyl group, said alkoxyalkyl group, said alkenyl group, said alkanoyl group or said benzyl group, when R.sub.1 is hydrogen atom and R.sub.2 is amino group or said alkylamino group, R.sub.3 and R.sub.4 individually is hydrogen atom or they may be the same or different and each represents said alkyl group, when R.sub.1 is amino group and R.sub.2 is nitro group, R.sub.3 and R.sub.4 may be the same or different and each represents said alkyl group or R.sub. 3 is hydrogen atom and R.sub.4 is said alkyl group or said alkenyl group, and when R.sub.1 is said group ##STR3## and R.sub.2 is nitro group, R.sub.3 and R.sub.4 are the same as defined above with respect to the R.sub.5 and R.sub.6. They are highly effective in the treatment of coccidiosis, especially that caused by the protozoa belonging to the species Eimeria tenella or E. necatrix.
吡啶衍生物具有以下结构式 ##STR1## 其中 R.sub.1 代表氢原子,氨基或一个基团##STR2## 其中 R.sub.5 和 R.sub.6 可以相同或不同,每个代表1至4个碳原子的烷基基团,或者 R.sub.5 为氢原子,R.sub.6 代表1至4个碳原子的烷基基团,3或4个碳原子的烯基基团或者苄基,可选择地取代卤素,氰基,1至4个碳原子的烷基或1至4个碳原子的烷氧基;R.sub.2 代表硝基,氨基或1至3个碳原子的烷基氨基基团;R.sub.3 和 R.sub.4 分别代表氢原子,1至4个碳原子的烷基基团,具有1至4个碳原子的烷氧基的烷氧基基团和2至4个碳原子的烷基基团,3或4个碳原子的烯基基团,1至18个碳原子的烷酰基团或苄基,可选择地取代卤素,氰基,1至4个碳原子的烷基或1至4个碳原子的烷氧基;但是当 R.sub.1 为氢原子且 R.sub.2 为硝基时,R.sub.3 和 R.sub.4 可以相同或不同,每个代表所述的烷基或所述的烷氧基基团,或者 R.sub.3 为氢原子且 R.sub.4 为氢原子,所述的烷基基团,所述的烷氧基基团,所述的烯基基团,所述的烷酰基团或所述的苄基,当 R.sub.1 为氢原子且 R.sub.2 为氨基或所述的烷基氨基基团时,R.sub.3 和 R.sub.4 分别为氢原子或它们可以相同或不同,每个代表所述的烷基基团,当 R.sub.1 为氨基且 R.sub.2 为硝基时,R.sub.3 和 R.sub.4 可以相同或不同,每个代表所述的烷基基团或 R.sub. 3 为氢原子且 R.sub.4 为所述的烷基基团或所述的烯基基团,当 R.sub.1 为所述的基团 ##STR3## 且 R.sub.2 为硝基时,R.sub.3 和 R.sub.4 与 R.sub.5 和 R.sub.6 相同。它们在球虫病的治疗中非常有效,特别是由属于 Eimeria tenella 或 E. necatrix 物种的原生动物引起的球虫病。