Phosphonoderivative of purine with antiviral activity
申请人:Beecham Group p.l.c.
公开号:EP0405748A1
公开(公告)日:1991-01-02
The (R)-isomer or the (S)-isomer of a compound of formula (IA), optionally in admixture with up to 45% of the mixture by weight of the corresponding (S)-isomer or the (R)-isomer respectively:
wherein
R₁¹ is hydroxy or amino;
R₂¹ is amino or hydrogen;
R₃¹ is hydroxymethyl or acyloxymethyl; and
R₄ is a group of formula:
wherein
R₅ and R₆ are independently selected from hydrogen, C₁₋₆ alkyl and optionally substituted phenyl; or
R₃ and R₄ together are:
wherein
R₆ is as defined above;
having antiviral activity, a process for their preparation and their use in the treatment of viral infections or neoplastic diseases.
Compounds of formula (I), and pharmaceutically acceptable salts thereof
wherein
R₁ is hydroxy, amino, chloro or OR₇
wherein
R₇ is C₁₋₆ alkyl, phenyl or phenyl C₁₋₂ alkyl either of which phenyl moieties may be substituted by one or two substituents selected from halo, C₁₋₄ alkyl or C₁₋₄ alkoxy;
R₂ is amino or, when R₁ is hydroxy or amino, R₂ may also be hydrogen;
R₃ is hydrogen, hydroxymethyl or acyloxymethyl;
R₄ is a group of formula:
R₅ and R₆ are independently selected from hydrogen, C₁₋₆ alkyl and optionally substituted phenyl; or
R₃ and R₄ together are:
wherein
R₆ is as defined above;
having antiviral activity, to processes for their preparation and their use as pharmaceuticals.