As a result of extensive studies on NAD(P)H oxidase inhibitors, the present inventors found that a quinolone derivative having, at the 2-position, an alkyl group substituted with a heteroatom or the like has an excellent NAD(P)H oxidase inhibitory activity, and accomplished the present invention. The compound of the present invention has a reactive oxygen species production inhibitory activity based on the NAD(P)H oxidase inhibitory activity, and therefore can be used as an agent for preventing and/or treating diabetes, impaired glucose tolerance, hyperlipidemia, fatty liver, diabetic complications and the like.
A new class of synthetic compounds with chemesthetic activity has been identified. They have been designed ex-novo by structural similarity with known cooling compounds such as menthol, icilin and cyclic ketoenamines. 19 new derivatives have been obtained easily and in high yields by Goldberg arylation or lactam ring closure on the appropriate phenol or benzoic acid derivative. The synthetic procedures