申请人:MEDIVIR AB
公开号:US20200399295A1
公开(公告)日:2020-12-24
The invention provides a compound of formula (I)
wherein
B is a nucleobase;
U is O or S;
R
x
is —OC(═O)R
y
, —OC(═O)CH(R
y
)NH
2
, —OCH
2
OC(═O)R
y
;
R
y
is optionally substituted alkyl or alkenyl or the side chain of a natural or unnatural amino acid
R
1
is H, or optionally substituted phenyl, benzyl, naphthyl, pyridyl or indolyl, or
R
x
and R
1
together define a bond thus forming a cyclic phosphate;
R
2
and R
2′
together define the side chain of a natural or unnatural amino acid;
R
3
is optionally substituted alkyl, cycloalkyl, phenyl or benzyl;
and pharmaceutically acceptable salts and compositions thereof
which are useful in the treatment of cancer, especially leukemias.