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。