3,6,7,8-substituted-s-triazolo-pyridazine compounds of the formula
wherein R3 represents hydrogen or loweralkyl, R6 represents amino, loweralkylamino, diloweralkylamino, heterocyclic amino or lower alkyl substituted heterocyclic amino, wherein the heterocyclic moiety forms a 5, 6 or 7 membered ring, having one or two ring nitrogen atoms and zero or one ring sulfur or oxygen atom; T7 represents loweralkyl; R8 represents hydrogen or loweralkyl; or R7 and R8 taken together represent polymethylene of 3 or 4 methylene units or polymethylene substituted by lower alkyl, or methano or ethano bridges; and their pharmacologically acceptable salts are made by reacting a carboxylic acid with a substituted 3-hydrazino-6-halo-pyridazine and then reacting the resulting 6-halotriazolopyridazine with a corresponding base. The compounds have pharmacological activity as bronchodilators.
式中,R3代表氢或低碳基,R6代表
氨基,低碳基
氨基,二低碳基
氨基,杂环
氨基或低碳基取代的杂环
氨基,其中杂环基形成一个5、6或7个成员的环,有一个或两个环氮原子和零或一个环
硫或氧原子;T7代表低碳基;R8代表氢或低碳基;或R7和R8一起代表3或4个亚甲基单元的聚甲基或低碳基取代的聚甲基,或
甲烷或
乙烷桥;它们的药物学可接受盐是由
羧酸与取代的3-
肼基-6-卤代
吡啶嗪反应,然后将得到的6-卤代三唑
吡啶与相应的碱反应制得的。这些化合物具有支气管扩张剂的药理活性。