Pyridone derivatives having affinity for cannabinoid 2-type receptor

摘要

It was found that the compound having a binding activity to the cannabinoid type 2 receptor represented by the formula (I): wherein R<1 >is a group represented by the formula: -Y<1>-Y<2>-Y<3>-R<a >wherein Y<1 >is single bond or the like; Y<2 >is -C(=O)-NH- or the like; Y<3 >is optionally substituted aryl or the like; R<2 >is hydrogen or the like; R<3 >is alkyl or the like; R<4 >is alkyl or the like; R<5 >is optionally substituted alkyl or the like; or R<3 >and R<4 >taken together with the adjacent atom form cyclic group or the like.