National Repository of Grey Literature 25 records found  previous11 - 20next  jump to record: Search took 0.00 seconds. 
Acyclic Nucleoside Phosphonates as Inhibitors of Hypoxanthine-Guanine-Xanthine Phosphoribosyltransferase: New Anti-Malarial Chemotherapy Leads
Hocková, Dana ; Holý, Antonín ; Česnek, Michal ; Baszczyňski, Ondřej ; Tichý, Tomáš ; Krečmerová, Marcela ; Janeba, Zlatko ; Skinner-Adams, T. S. ; Naesens, L. ; Keough, D. T. ; de Jersey, J. ; Guddat, L. W.
Hypoxanthine-guanine-xanthine phosphoribosyltransferase (HGXPRTase) is a widely recognized target for the discovery of new anti-malarial drugs. Specific acyclic nucleoside phosphonates (ANPs) inhibit HGXPRTase and possess anti-plasmodial activity. Within the framework of a SAR-study, the classical ANPs (e.g. PME-, PMP- and HPMP-derivatives) as well as novel series of compounds were tested to investigate their efficiency and selectivity on the inhibition of P. falciparum, P. vivax and human enzyme.
3-Fluoro-2-(phosphonomethoxy)propyl hypoxanthine and guanine derivatives as inhibitors of plasmodial hypoxanthine-guanine-xanthine phosphoribosyltransferases
Baszczyňski, Ondřej ; Jansa, Petr ; Hocková, Dana ; Janeba, Zlatko ; Dračínský, Martin ; Holý, Antonín ; Keough, D. T. ; de Jersey, J. ; Guddat, L. W.
A new methodology for the synthesis of ANPs containing 9-[2-(phosphonoethoxy)ethyl] (PEE) moiety has been developed. FPEP compound containing guanine moiety exhibited inhibition activity against the enzyme in micromolar range without any signs of toxicity.
The efficient synthesis of 2-aryl substituted pyrimidine acyclic nucleoside phosphonates using Liebeskind-Srogl cross-coupling
Česnek, Michal ; Břehová, Petra ; Dračínský, Martin ; Holý, Antonín ; Janeba, Zlatko
A series of novel acyclic nucleoside phosphonates with a built-in 2-arylsubstituted pyrimidine moiety has been prepared using the Liebeskind-Srogl cross-coupling protocol. The reactions of highly functionalised 2-methylsulfanylpyrimidines with various arylboronic acids were studied and optimised.
Biological properties of the C-8 substituted analogues of 9-[2-(phosphonomethoxy)ethyl]adenine (PMEA)
Janeba, Zlatko ; Holý, Antonín ; Zídek, Zdeněk
The 9-[2-(phosphonomethoxy)ethyl]adenine (PMEA) derivatives substituted at the C-8 position of the purine moiety did not exhibited any pronounced antiviral or antimalarial activity, but both 8-hydroxy and 8-sulfanyl derivatives of PMEA possess significant immunostimulatory activities.
Synthesis and biological properties of the 2’-trifluoromethyl analogues of tenofovir
Jansa, Petr ; Kolman, Viktor ; Janeba, Zlatko
A series of acyclic nucleoside phosphonates substituted at the aliphatic part of the molecule by the trifluoromethyl group was prepared but none of the compounds exhibits any anti-HIV or anti-HCV activities.
Efficient one-pot synthesis of polysubstituted 6-[(1H-1,2,3-triazol-1-yl)methyl]uracils through the "click" protocol
Jansa, Petr ; Špaček, Petr ; Holý, Antonín ; Votruba, Ivan ; Janeba, Zlatko
Synthesis of triazoloacyclic nucleosides and nucleoside phosphonates was developed as the one-pot Cu(I)-catalyzed azide alkyne Huisgen "click" cycloaddition. A novel Cu(I)-catalyzed decarboxylation reaction of 1-substituted 1H-1,2,3-triazole-4-carboxylates at room temperature was observed and used for the preparation of 1-substituted 1H-1,2,3-triazoles.
Use of 1,3-dioxolanes in the syntheses of alpha-branched alkyl and aryl N-9-[2-(phosphonomethoxy)ethyl]purines
Pomeisl, Karel ; Holý, Antonín ; Krečmerová, Marcela
Syntheses of various alkyl and aryl substituted N-9-[2-(phoshonomethoxy)ethyl]purines from a number of 2-alkyl(aryl)-1,3-dioxolanes were developed in preparative yields. The cleavage of a dioxolane ring with Lewis acids was chosen for preparation of suitable phosphonate building blocks as a key reaction step followed by their Mitsunobu reaction with purine bases. Obtained phosphonate derivatives were tested as potential HG(X)PRTase inhibitors. In contrast to previously published N-9-[2-(phosphonoethoxy)ethyl]purines, no inhibitory activity towards this enzyme was observed.
Příprava 8-C-substituovaných acyklických nukleosidfosfonátů odvozených od 2,6 diaminopurinu s využitím Negishiho cross-couplingu
Sedláček, Ondřej ; Pohl, Radek ; Holý, Antonín
8-Allyl-, cyclopropyl-, trifluoromethyl-, cyano-, carbethoxy- and acetaldehydo-2,6-diamino- 9-[2-(phosphonomethoxy)ethyl]purine (PMEDAP) were prepared by Negishi cross-coupling of the 8-bromo-PMEDAP under catalysis with Pd2dba3 with various phosphine ligands followed by deprotection.
Studium chemické stability antivirově aktivních 5-azacytosin acyklických nukleosidfosfonátů pomocí NMR spektroskopie
Dračínský, Martin ; Krečmerová, Marcela ; Holý, Antonín
Hydrolytic decomposition of four 5-azacytosine acyclic nucleoside phosphonates was studied. Products of the decomposition are carbamoylguanidine derivatives. Stability and decomposition products of HPMP-5-azaC (a 5-azacytosine derivative with strong antiviral activity) differ from the other derivatives.
Syntézy látek mimikujících acyklické nukleosiddifosfáty
Doláková, Petra ; Dračínský, Martin ; Holý, Antonín
A series of acyclic nucleoside diphosphate mimics bearing purine and pyrimidine bases was prepared by Mitsunobu reaction of protected heterocyclic bases with appropriate alcohol containing stable diphosphate analogue.

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