PROCESS FOR PRODUCING BENZIMIDAZOLE DERIVATIVES

摘要

Benzimidazole derivatives of the following formula, wherein R<1> indicates hydrogen atom, lower alkyl group having carbon atoms of 1 to 6 or dimethylaminopropyl group, R<2> indicates hydrogen atom or lower alkanoyl group having carbon atoms of 1 to 3, R<3> indicates hydrogen atom, lower alkyl group having carbon atoms of 1 to 3 or lower alkanoyl group having carbon atoms of 1 to 3, X indicates sulfur atom, sulfinyl group, sulfonyl group, amino group or methylene group, A indicates alkylene group having carbon atoms of 1 to 12, which alkylene group may optionally be substituted by hydroxy group or lower alkyl group having carbon atoms of 1 to 3, - (CHR')n-CR''=CR''-(CHR')m-, (in which R' and R'' are each independently hydrogen atom, lower alkyl group having carbon atoms of 1 to 3 or hydroxy group, and n and m are equal to 0, 1, 2 or 3), and Y indicates oxygen atom or sulfur atom; their acid or alkali salts and hydrate thereof are useful as antiallergic agents.