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Abstract

The present invention relates to a simple method for preparing a quinolinone derivative, which is effective as a medicine, e.g., as an agent for treating allergic diseases and the like; novel amide derivatives effective as an intermediate in the method, novel quinolinone derivatives obtained according to the method; and an anti-allergic agent containing a quinolinone derivative and/or physiological salt of the same as the active ingredients. The quinolinone derivative is expressed by the following general formula (II); and the method is characterized in that an amide derivative, expressed by the following general formula (I), is reacted with a basic agent, followed by intramolecular ring formation: General Formula (I) ##STR1## [wherein, R.sub.1 represents a hydrogen atom, an alkyl group, an alkyl group containing a hydroxyl group, an alkenyl group, or an aryl group; R.sub.2 represents an alkyl group, an alkenyl group, an aryl group, or an aralkyl group; R.sub.3 represents a reactive carboxyl group; and R.sub.4 to R.sub.7 represent, respectively and independently, a hydrogen atom, a hydroxyl group, an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group, an aryl group, an aryloxy group, an aralkyloxy group, a R.sub.8 R.sub.9 N group (wherein, R.sub.8 and R.sub.9 represent, respectively and independently, a hydrogen atom, an alkyl group, an alkenyl group, an aralkyl group, or an acyl group), a nitro group, or a R.sub.10 OOC group (wherein, R.sub.10 represents a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, or an aralkyl group)]. General Formula (II) ##STR2## [wherein, R.sub.1, R.sub.2 and R.sub.4 to R.sub.7 represent, respectively, the same constituents as described in general formula (I)].

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