The present invention relates to a compounds according to formula I, methods for treating diseases mediated by human immunodeficieny virus by administration of a compound according to formula I and pharmaceutical compositions for treating diseases mediated by human immunodeficieny virus containing a compound according to formula I where R
1
, R
2
, R
3
, R
4
, R
5
, are as defined herein.
Compounds of formula I, wherein R
1
, R
2
, R
3
, X
1
, X
2
and Ar, are as defined herein or pharmaceutically acceptable salts thereof, inhibit HIV-1 reverse transcriptase and afford a method for prevention and treatment of HIV-1 infections and the treatment of AIDS and/or ARC. The present invention also relates to compositions containing compounds of formula I useful for the prevention and treatment of HIV-
1
infections and the treatment of AIDS and/or ARC.
The present invention provides compositions for treating an HIV infection comprising administering a compound according to formula I where Ar, R
1
-R
5
, R
11c
and X
1
are as defined herein with at least one carrier, excipient or diluent.