Compounds of formula I:
wherein:
R
2
is hydrogen or C
1
-C
4
alkyl;
R
3
and R
4
are hydrogen, —C(═O)R
5
, or —C(═O)CHR
6
—NH
2
; or
R
3
is hydrogen and R
4
is a monophosphate-, diphosphate-, or triphosphate ester; or R
3
is hydrogen, —C(═O)CHR
5
, or —C(═O)CHR
6
—NH
2
and R
4
is
each R
5
is hydrogen, C
1
-C
6
alkyl, or C
3
-C
7
cycloalkyl;
R
6
is hydrogen or C
1
-C
6
alkyl;
R
7
is optionally substituted phenyl; naphthyl; or indolyl;
R
8
and R
8′
are hydrogen, C
1
-C
6
alkyl, benzyl; or
R
8
and R
8′
combined form C
3
-C
7
cycloalkyl;
R
9
is C
1
-C
6
alkyl, benzyl, or optionally substituted phenyl;
provided that R
2
, R
3
and R
4
are not all hydrogen;
or a pharmaceutically acceptable salt or solvate thereof;
pharmaceutical formulations with the compounds I; the use of compounds I, including the compounds of formula I wherein R
2
, R
3
and R
4
are all hydrogen, as HCV inhibitors.
Reactions of trimethylsilyl fluorosulfonyldifluoroacetate with purine and pyrimidine nucleosides
作者:Magdalena Rapp、Xiaohong Cai、Wei Xu、William R. Dolbier、Stanislaw F. Wnuk
DOI:10.1016/j.jfluchem.2008.12.004
日期:2009.3
4-hydroxyl group of the enolizable uracil ring. Reaction of the difluorocarbene with the adenosine substrates having the unprotected 6-amino group in the purine ring produced the 6-N-difluoromethyl derivative, while reaction with 6-N-benzoyl protected adenosine analogues gave the difluoromethyl ether product derived from the insertion of difluorocarbene into the enol form of the 6-benzamido group. Treatment