Szénhidrát alapú C- és CH2-szulfonsavak szintézise és biológiai vizsgálata, továbbá cukorszulfopeptidek előállítása = Synthesis and biological investigation of carbohydrate containing C- and CH2- sulfonic and that of the sugar sulfopeptides
2010
Oteves celkitűzesunk alatt 16 nemzetkozi kozlemenyt publikaltunk. Mindenekelőtt a szenhidratszulfonsavak előallitasanak kulonboző lehetősegeit vizsgaltuk. Eredmenyesen valositottuk meg az intra- es intermolekularis nukleofil reakciokat. Legfontosabb celkitűzesunk, a a cukorszulfonsavak előallitasara alkalmas reakciok vizsgalata, pl. az 1-tio-2-O-mezil-beta-D-glukozidok es 1-tio-2-O-mezil-alfa-D-mannozidok transzformacioja 1,2-transz-D-manno- ill. glukopiranozidda. Kiemelhető az exo-metilen csoport bevezetese es szulfonometil-csoportta alakitasa szulfit addicioval. Az izolalt vegyuletek konfiguraciojanak es konformaciojanak meghatarozasa 1H- es 13C-NMR segitsegevel, ill. oldat es szilard fazisu chiroptikai modszerrel tortent. Az N-acetilneuraminsav analogok szinetziset L-fukozbol kiindulva valositottuk meg. A vegyulet gyűrű-rendszere biologiai aktivitast mutat. A vegyuletek hianyzo anomer protona kovetkezteben tavolhato NMR meresek es molekularis szamitasok (QM) elengedhetetlenul szuksegesek voltak. Magasabb tagszamu 3,6 elagazasu arabinogalaktan oligoszacharidok (tetra es hexa) előallitasat megvalositottuk. A Mycobacterium avium 19-es szerovarians sejtfelszini pentaszacharidjanak szinteziset a kozelmultban valositottuk meg. A legvonzobb eredmeny a szulfonsavtartalmu heparinoid mono- es oligoszacharidok szintezise. Valamennyi epitőelem alkalmas vedőcsoportkent kezelhető. Jelenleg 6 diszacharid egyseg a kozeli jovőben pentaszacharidig teljesithető. | As a result of our OTKA project, aimed, primarily, at the investigation of the possibilities for the preparation carbohydrate sulfonic acids, 16 papers were published in international journals. We realized the transformation of 1-thio-2-O-mesyl-beta-D-glucopyranosides and 1-thio-2-O-mesyl-alpha-D-mannopyranosides into 1,2-trans-D-manno- and glucopyranosides. An important result is the introduction of the exo-methylene group and its conversion into sulfonatomethyl moiety by sulfit addition. The determination of the configuration and conformation of the isolated compounds was carried out with NMR techniques, as well as by means of solution- and solid-phase chiroptical methods. The N-acetylneuraminic acid analogues were synthesized from L-fucose. The prepared compounds, carrying the demanded ring-system, showed biological activity. Due to the missing anomeric proton of such ketoses, long-range NMR coupling measurements and molecular calculatios (QM) were established. Our research group performed the preparation of 3.6-branched arabinogalactan oligosaccharides. The synthesis of the pentasaccharide of the Mycobact. avium serovar 19 was recently accomplished. Our most attractive results include those which are in connection with the sulfonatomethyl mono- and oligosaccharide analogues of heparin. The disaccharides of the required heparin-pentasaccharides have been synthesized.
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