Zobrazeno 1 - 10
of 206
pro vyhledávání: '"Mária Kajtár-Peredy"'
Publikováno v:
Carbohydrate Research. 343:596-606
Efficient preparations of thioglycoside derivatives of L-idose and L-iduronic acid are described. The method avoids the tedious chromatographic separations of furanose and pyranose anomeric mixtures, and affords the thioglycosides in a stereoselectiv
Autor:
Flórián Tóth, Csaba Szántay, Mária Kajtár-Peredy, László Hazai, Ágnes Gömöry, Vajk Daniel Horvath, István Greiner, György Kalaus
Publikováno v:
Tetrahedron. 63:7823-7827
The first total synthesis of the pentacyclic alkaloid (±)-18-hydroxy-20-epiibophyllidine was realized via an efficient preparation of the d -seco-pseudoaspidospermane molecule. The key step of the sequence involves an intramolecular [4+2] cycloaddit
Autor:
Mária Kajtár-Peredy, László Hazai, György Kalaus, Flórián Tóth, István Greiner, Ágnes Gömöry, Csaba Szántay
Publikováno v:
Tetrahedron. 62:12011-12016
Starting from methyl-5-oxohexanoate we produced the appropriately functionalized aldehyde, which, after having been allowed to react with the tryptamine derivative in a [4+2] cycloaddition reaction as the final step, yielded the molecule containing a
Autor:
Gyula Simig, Antal Feller, Mária Kajtár-Peredy, Eva Boros, József Fetter, Ferenc Bertha, Gábor Czira
Publikováno v:
Journal of Heterocyclic Chemistry. 43:371-388
Two efficient methods have been developed for the synthesis of variously substituted 2-aminomethylazetidine derivatives 5 by regioselective nucleophilic substitution of 4-mesyloxymethylazetidin-2-ones 3 followed by reduction or by reduction of the ap
Autor:
Mária Kajtár-Peredy, Gábor Czira, Ferenc Bertha, Antal Feller, Gyula Simig, Eva Boros, József Fetter
Publikováno v:
Journal of Heterocyclic Chemistry. 43:87-94
The reaction of 4-mesyloxymethylazetidin-2-one derivatives 3 with ammonia and sodium methoxide was investigated. The two electrophilic centers of the substrate reactesuccessively, resulting in cleavage of the lactam bond and formation of a new azirid
Publikováno v:
Nucleosides, Nucleotides and Nucleic Acids. 24:247-257
Synthesis and stereochemical characterization of enantiomerically pure nucleoside-3'-phosphorothioate esters and salts are reported. Vicinal carbon phosphorus couplings reflect different predominance of the epsilon conformation in the isomeric (Rp an
Autor:
Csaba Szántay, Károly Vékey, György Kalaus, Lajos Dr Szabo, László Léder, István Greiner, Mária Kajtár-Peredy
Publikováno v:
Tetrahedron. 59:5661-5666
A molecule with an indole skeleton, containing a latent acrylic ester function—acting as a diene—readily reacted with benzoic acid (4-bromomethylene-5-oxo)hexyl ester that had been built up from pentane-2,4-dione. Dehydration of the enamine and s
Autor:
Mária Kajtár-Peredy, György Kalaus, János Éles, Csaba Szántay, István Greiner, Lajos Dr Szabo, Pál Szabó
Publikováno v:
Tetrahedron. 58:8921-8927
A molecule with an indole skeleton, containing a latent acrylic ester function—acting as a diene—was produced from Nb-trityl-2-(hydroxy-methyl)-tryptamine and reacted with esters containing an aldehyde or aldehyde-equivalent structural unit, yiel
Autor:
György M. Keserü, János Éles, György Kalaus, Lajos Dr Szabo, István Greiner, Csaba Szántay, Pál Szabó, Mária Kajtár-Peredy
Publikováno v:
The Journal of Organic Chemistry. 67:7255-7260
The first syntheses of the alkaloids (−)-mehranine (3), (+)-voaphylline/conoflorine (4), (+)-Na-methylvoaphylline/hecubine (5), and (−)-lochnericine (2) were achieved by stereoselective epoxidation starting from (−)-tabersonine (1), through int
Autor:
Mária Kajtár-Peredy, György Kalaus, Lajos Dr Szabo, Csaba Szántay, Pál Szabó, Albert Lévai, István Greiner, János Éles
Publikováno v:
Journal of Heterocyclic Chemistry. 39:767-771
The oxidation of (-)-tabersonine (1) with dimethyldioxirane (DMD) in neutral and acidic medium gave 16-hydroxytabersonine-N-oxide (3) and the didehydrovincamine isomers 4 and 5, respectively. (+)-14,15-Didehydro-quebrachamine (7) furnished the hydrox