The imidazo[1,2-b]pyridazine compounds of the formula: ##STR1## wherein R.sub.1 is a hydrogen or 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 heterocyclic ring optionally having substituent(s), X is an oxygen atom or S(O).sub.n (n=0 to 2), Alk is a straight or branched chain alkylene group containing 1-10 carbon atoms and optionally having substituent(s), or their pharmaceutically acceptable salts which possess antiallergic, anti-inflammatory and anti-PAF activities, and their production and use.
式为:##STR1##的
咪唑并[1,2-b]
吡嗪化合物,其中R.sub.1是氢原子或卤素原子,或是具有取代基的低碳基,R.sub.2和R.sub.3是独立的氢原子,具有取代基的低碳基,环烷基或苯基,或R.sub.2和R.sub.3与它们所键合的相邻氮原子一起可以形成具有取代基的杂环,X是氧原子或S(O).sub.n(n = 0到2),Alk是含有1-10个碳原子的直链或支链烷基,并且可以具有取代基,或其药学上可接受的盐,具有抗过敏,抗炎和抗PAF活性,以及它们的生产和使用。