Novel nucleotide analogues bearing (1H-1,2,3-triazol-4-yl)phosphonic acid moiety as inhibitors of Plasmodium and human 6-oxopurine phosphoribosyltransferases

A novel family of acyclic nucleoside phosphonates (ANPs) bearing a (1H-1,2,3-triazol-4-yl)phosphonic acid group in the acyclic side chain have been prepared in order to study the influence of the hetaryl rigidizing element on the biological properties of such compounds. The key synthetic step consisted of a copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) between diethyl ethynylphosphonate and the corresponding azidoalkyl precursor. Two ANPs in this family, bearing a guanine base, exhibited the highest potency for the human 6-oxopurine phosphoribosyltransferase irrespective of the stereochemistry on the C-2′ atom. Four compounds inhibited Plasmodium falciparum 6-oxopurine phosphoribosyltransferase with little differences in their Kvalues irrespective of whether the base was guanine, hypoxanthine or xanthine but only two, with guanine as base, inhibited PvHGPRT

Synthesis and biological properties of polysubstituted 5-nitrosopyrimidines

2,4,6-Triamino-5-nitrosopyrimidines have been reported to contain a strong intramolecular hydrogen bond between the 5-nitroso and 4- or 6-amino groups, thus forming an additional pseudoring. Such analogues were speculated to be good mimics of fused bicyclic derivatives, e.g. purines. A series of novel polysubstituted 2-amino-5-nitrosopyrimidines, as potential structural mimics of modifi ed purine nucleos(t)ides well-known for their important biological properties, has been designed and synthesized. The physicochemical and biological properties of the prepared polysubstituted 2-amino-5-nitrosopyrimidines are being evaluated

Reactive cyclic intermediates in the ProTide prodrugs activation: trapping the elusive pentavalent phosphorane

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