Cyclic enol derivatives, production and use thereof.

摘要

The present invention relates to a compound of the formula: <CHEM> wherein X is sulfur or optionally substituted imino group; Y is a bond, oxygen, phenylene, phenyleneoxy, or oxyphenyleneoxy; R<1> is hydrogen or optionally substituted hydrocarbon residue; R<2> is optionally substituted hydrocarbon residue; and R<1> may form, together with the imino-nitrogen atom as X, a nitrogen-containing 5- to 7-membered ring, production and use thereof. The compound (I) of the present invention has an anti-oxidation activity and activities of preventing or improving functional disorders due to biologically active oxygen species, thus being useful as a pharmaceutical agent for prophylaxis and therapy of disorders in the circulatory system.