Compounds of formula (I):
[in which; Q is nitrogen or =CH-; R1 and R2 are hydrogen, alkyl, alkoxy, hydroxy, trifluoromethyl or halogen; and R3 is various specific substituted alkyl groups] and pharmaceutically acceptable salts thereof have valuable anti-allergic and anti-asthmatic activities. They may be prepared by reacting a corresponding compound where R3 is replaced by a hydrogen atom with a compound to introduce the group R3.
式(I)化合物:
[其中,Q 为
氮或 =CH-;R1 和 R2 为
氢、烷基、烷
氧基、羟基、三
氟甲基或卤素;R3 为各种特定的取代烷基]及其药学上可接受的盐类具有重要的抗过敏和抗哮喘活性。它们可以通过将 R3 被
氢原子取代的相应化合物与引入基团 R3 的化合物反应来制备。