It has been found that the novel compounds of the formula
wherein R¹ is hydrogen or lower alkyl, R² is hydrogen or halogen, R³ is hydrogen or lower alkyl, R⁴ is hydrogen or lower alkyl, R⁵ is hydrogen, lower alkyl or aralkyl, X is alkylene and n is an integer from 1 to 6,
the enantiomers thereof and, when R⁵ is hydrogen, the salts thereof with pharmaceutically acceptable bases have antiallergic properties and can accordingly be used as medicaments for the treatment or prevention of allergic conditions. The compounds of formula I can be manufactured by reacting a compound of the formula
with a compound of the formula
and optionally hydrolyzing the compound thus obtained.
发现式中的新型化合物
其中 R¹ 是氢或低级烷基,R² 是氢或卤素,R³ 是氢或低级烷基,R⁴ 是氢或低级烷基,R⁵ 是氢、低级烷基或芳烷基,X 是亚烷基,n 是 1 至 6 的整数、
其对映体,以及当 R⁵ 为氢时,其与药学上可接受的碱的盐具有抗过敏特性,因此可用作治疗或预防过敏症的药物。式 I 的化合物可通过将式 I 的化合物与式 I 的化合物反应制得
与式
并可选择
水解由此得到的化合物。