申请人:SANKYO COMPANY LIMITED
公开号:US20030207841A1
公开(公告)日:2003-11-06
A compound of the formula (1):
1
wherein R
1
and R
2
are the same or different and represent a hydrogen atom, a hydroxyl protecting group, a phosphate group, or —P(R
3
)R
4
, wherein R
3
and R
4
are the same or different and represent a hydroxyl group, an amino group, an alkoxy group having from 1 to 4 carbon atoms, a cyanoalkoxy group having from 1 to 5 carbon atoms or an amino group substituted by an alkyl group having from 1 to 4 carbon atoms; A represents an alkylene group having from 1 to 4 carbon atoms and B represents a purin-9-yl group, a 2-oxo-pyrimidin-1-yl group, a substituted purin-9-yl group or a substituted 2-oxo-pyrimidin-1-yl group having a substituent &agr; selected from the group consisting of a hydroxyl group which may be protected, an alkoxy group having from 1 to 4 carbon atoms, a mercapto group which may be protected, an alkylthio group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms, an amino group which may be protected, a mono- or di-alkylamino group which may be substituted by an alkyl group having from 1 to 4 carbon atoms, an alkyl group having from 1 to 4 carbon atoms and a halogen atom; or a salt thereof.