Compounds of the formula ##STR1## and pharmaceutically acceptable, nontoxic salts thereof or hydrates thereof, wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each hydrogen, halogen, lower alkyl or lower alkoxy, or any two of the groups R.sub.1, R.sub.2, R.sub.3 and R.sub.4, taken together with the carbon atoms to which they are joined complete a substituted or unsubstituted carbocyclic ring, and X is an oxygen atom, provided that R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are not all simultaneously hydrogen, are useful for treating allergic conditions in humans. The compounds may be prepared by reacting a suitably substituted benzene derivative with an activated carbonyl group having a carbanion of the formula NC-CH-R, wherein R is a carboxylic acid ester group, and thereafter, if desired, converting the compound into a salt.
公式为##STR1##的化合物及其药学上可接受的、无毒的盐或
水合物,其中R1、R2、R3和R4分别为氢、卤素、低烷基或低烷氧基,或者是R1、R2、R3和R4中的任意两个,与它们连接的碳原子一起形成取代或未取代的碳环,而X是一个氧原子,前提是R1、R2、R3和R4不同时为氢,这些化合物对于治疗人类的过敏症是有用的。这些化合物可以通过将适当取代的苯衍
生物与具有公式NC-CH-R的羰基活化基团反应制备而成,其中R是
羧酸酯基团,如果需要,可以将化合物转化为盐。