| abstract |
A method for producing a compound represented by formula (Y1) or formula (Y2) (wherein, R X is an optionally substituted carbocyclic lower alkyl group, etc.) or a salt thereof, using formula (X4) (wherein, R 1d is hydrogen, halogen, etc., R 2d is hydrogen, lower alkyl which may be substituted by substituent group E, etc., R 4d is lower alkyl which may be substituted by substituent group E, etc., and R 6d is which may be substituted by substituent group E A new production method of pyridone derivatives represented by E-substituted lower alkyl, etc., . |