| abstract |
A method for preparIng a compound represented by the followIng formula (Y1) or (Y2), or a salt thereof Is provIded, whIch Is a novel preparatIon method comprIsIng usIng a pyrIdone derIvatIve represented by the followIng formula (X4) (In formula, R1d Is hydrogen, halogen, and the lIke; R2d Is hydrogen, lower alkyl optIonally substItuted by the substItuent group E, and the lIke; R4d Is lower alkyl optIonally substItuted by the substItuent group E, and the lIke; R6d Is lower alkyl optIonally substItuted by the substItuent group E, and the lIke). |