申请人:Sumino Yukihito
公开号:US20140011995A1
公开(公告)日:2014-01-09
A process for preparing a compound represented by formula (Y1) or (Y2) [wherein R
x
is an optionally substituted carbocyclyl lower alkyl, or the like] or a salt thereof, using a novel process for preparing a pyridone derivative represented by formula (X4) [wherein R
1d
is hydrogen, halogen, or the like; R
2d
is hydrogen, a lower alkyl optionally substituted with substituent E, or the like; R
4d
is a lower alkyl optionally substituted with substituent E, or the like; and R
6d
is a lower alkyl group optionally substituted with substituent group E, or the like].