National Repository of Grey Literature 69 records found  beginprevious21 - 30nextend  jump to record: Search took 0.01 seconds. 
The unique impact of microwave irradiation on the chemistry of acyclic nucleoside phosphonates
Jansa, Petr ; Holý, Antonín ; Dračínský, Martin ; Baszczyňski, Ondřej ; Česnek, Michal ; Janeba, Zlatko
Latest improvements of the syntheses of ANPs using microwave irradiation are presented, namely a novel, efficient, and environmentally friendly synthesis of dialkyl haloalkylphosphonates via the microwave-assisted Michaelis-Arbuzov reaction and microwave-assisted hydrolysis of phosphonate diesters.
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.
Nukleosidy a nukleotidy obsahující 8-aza-7,9-dideazaxanthin
Mařák, David ; Otmar, Miroslav ; Dračínský, Martin ; Votruba, Ivan ; Holý, Antonín
The described preparation of 8-aza-7,9-dideazaxanthine from 1,3-dibenzyluracil and TosMIC was improved by using AlCl3 for final debenzylation. Treatment of 6-dibromomethyl- 5-formyluracil with benzyl-, 4-methoxybenzyl-, and 1-adamantylamine gave the corresponding 8-alkyl-8-aza-7,9-dideazaxanthines. N1- and N8-(8-phosphonooctyl)-8-aza-7,9-dideazaxanthines were prepared and found as inhibitors of thymidine phosphorylase (V79 cells, human placenta, Escherichia coli). IC50 values ranged at 3–27 .mu.M.
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.
Snadné syntézy pyrimidinových acyklických nukleosidfosfonátů a jejich potenciál v biomedicinálních aplikacích
Pomeisl, Karel ; Holý, Antonín ; Votruba, Ivan ; Nencka, Radim ; Pohl, Radek
The presented syntheses using a nucleophilic fluorination, Suzuki–Miyaura coupling reactions and phosphorylation were successfully applied for the preparation of a number of pyrimidine acyclic nucleoside phosphonates in connection of finding of potential bioactive compounds.
Efektivní syntézy acyklických nukleosidfosfonátů s jedním otevřeným a jedním nově uzavřeným kruhem
Jansa, Petr ; Dračínský, Martin ; Holý, Antonín
In order to study the SAR, we prepared new 6-[2-(phosphonomethoxy)ethoxy]-2,4-diaminopyrimidine (PMEO-DAPy) analogues substituted by another ring between positions 4 and 5.
Příprava N9-(3-fluoro-2-phosphonomethoxypropyl) (FPMP) derivátů N6-substituovaných adeninů a 2,6-diaminopurinů
Baszczyňski, Ondřej ; Holý, Antonín ; Dračínský, Martin ; Klepetářová, Blanka
An efficient method of the synthesis N9-(3-fluoro-2-phosphonomethoxypropyl) (FPMP) derivatives of purine bases was developed. A series of N6-substituted FPMP dervatives of purine and 2-aminopurine were prepared by using this method.

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