PYRIDINE DERIVATIVES AND PROCESS FOR PREPARING THE SAME

摘要

The invention is concerned with novel pyridine derivatives having the general formula: < IMG > (I) wherein R1 is a hydrogen atom or a lower alkyl group which may be substituted with hydroxy, lower alkoxy or di-lower alkylamino; R2 is a hydrogen atom, an amino group or a lower alkylamino group; and R3 is a lower alkyl group, as well as the pharmaceutically acceptable salts thereof. The derivatives of the formula (I) and their pharmaceutically acceptable salts exhibit antiallergic effects by the two different mechanisms and hence are useful as drugs for treating allergic diseases such as asthma, pollen allergy, atopic dermatitis and the like.