申请人:Takeda Chemical Industries, Ltd.
公开号:US05145850A1
公开(公告)日:1992-09-08
An imidazo [1,2-b]pyridazine compound of the formula (I): ##STR1## wherein R.sub.1 is a halogen atom or a lower alkyl group optionally having substituent(s), R.sub.2 and R.sub.3 are, independently, a hydrogen atom, a lower alkyl group optionally having substituent(s), a cycloalkyl group or a phenyl group optionally having substituent(s) or R.sub.2 and R.sub.3 together with the adjacent nitrogen atom to which they bond may form a heterolcyclic ring optionally having substituent(s), X is an oxygen atom or S(O).sub.k (k is zero to two), a group --.circle.A-- is a bivalent three to seven membered homocyclic or heterocyclic group optionally having substituent(s), m.sup.1 and m.sup.2 each is an integer of 0 to 4 and n is an integer of 0 or 1; or its salt, which is useful as antiasthmatics.
化学式(I)的一种咪唑[1,2-b]吡啶嗪化合物:##STR1##其中R.sub.1是卤素原子或一个较低的烷基基团,可选择地具有取代基;R.sub.2和R.sub.3分别是氢原子、一个较低的烷基基团(可选择地具有取代基)、一个环烷基基团或一个苯基(可选择地具有取代基),或者R.sub.2和R.sub.3与它们连接的相邻氮原子一起可能形成一个杂环环(可选择地具有取代基);X是一个氧原子或S(O).sub.k(k为零到二);一个--.circle.A--基团是一个二价的三到七成员的同环或异环基团,可选择地具有取代基;m.sup.1和m.sup.2分别是0到4的整数,n是0或1的整数;或其盐,该盐可用作抗哮喘剂。