Search Results - "Rykowski, Andrzej"

Synthesis of Aza-Analog of N-Methylated Acycloformycin A by Mojzych, Mariusz, Rykowski, Andrzej

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A facile approach to 2,2′-bipyridine based thiacrown ethers and their sulfoxides by DA-rDA reaction of 5,5′-bi-1,2,4-triazine thiamacrocycles. The conformation studies by Ławecka, Justyna, Karczmarzyk, Zbigniew, Olender, Ewa, Wolińska, Ewa, Branowska, Danuta, Rykowski, Andrzej

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Pyrazolo[4,3-e][1,2,4]triazines: purine analogues with electronic absorption in the visible region by Mojzych, Mariusz, Rykowski, Andrzej, Wierzchowski, Jacek

“…Synthesis of several pryrazolo[4,3-e][1,2,4]-triazines is described. The absorption spectrum of some 5-substituted derivatives was found to extend to the…”
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2-(3-Chloro-5,6-diphenyl-2,5-dihydro-1,2,4-triazin-5-yl)-2-methylpropanenitrile by Wolińska, Ewa, Karczmarzyk, Zbigniew, Rykowski, Andrzej, Urbańczyk-Lipkowska, Zofia, Kalicki, Przemysław

“…The title compound, C 19 H 17 ClN 4 , was obtained from the reaction of 3-chloro-5,6-diphenyl-1,2,4-triazine with isobutyronitrile in the presence of lithium…”
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A New Synthesis of Pyrazolo- [4,3-e][1,2,4]triazines via Acid Promoted Ring Closure of the Phenylhydrazones of 5-Acyl-1,2,4-triazines by Rykowski, Andrzej, Mojzych, Mariusz, Karczmarzyk, Zbigniew

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Tandem Vicarious Nucleophilic Substitution of Hydrogen/Intramolecular Diels–Alder Reaction of 1,2,4-Triazines into Functionalized Cycloalkenopyridines by Branowska, Danuta, Ostrowski, Stanislaw, Rykowski, Andrzej

“…Synthesis of 2,3- and 3,4-cyclopentenopyridines, 5,6,7,8-tetrahydroquinolines and 5,6,7,8-tetrahydroisoquinolines from 1,2,4-triazine derivatives is reported…”
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Palladium-catalyzed cross-coupling of 5-acyl and 5-formyl-1,2,4-triazines and their derivatives with heteroaromatic tin compounds by Branowska, Danuta, Olender, Ewa, Rykowski, Andrzej

“…The synthesis of novel mono- and di(substituted)-1,2,4-triazine derivatives containing thiophene and furan rings are described. Heteroaromatic rings were…”
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Vicarious nucleophilic substitution of hydrogen vs. ANRORC-type ring transformation in reactions of 1,2,4-triazines with α-halocarbanions. Novel route to functionalized pyrazoles by Rykowski, Andrzej, Wolinska, Ewa, Branowska, Danuta, Plas, Henk C. Van der

“…A novel route to pyrazole derivatives bearing sulfonyl, aminosulfonyl, alkoxy- and aryloxysulfonyl groups at C-3 by ring transformation of…”
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Transformations of phenylhydrazones of 5-acyl-1,2,4-triazines to pyrazolo[4,3-e][1,2,4]triazines or 4-cyanopyrazole by Mojzych, Mariusz, Rykowski, Andrzej

“…A simple and high yielding preparation of pyrazolo[4,3‐e][1,2,4]triazines and 4‐cyano‐3‐methyl‐1‐phenylpyrazole derivatives from corresponding phenylhydrazones…”
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A novel approach to conformationally strained 2,2′-bipyridine thiacrown ethers and their chiral sulfoxides by sequential homo-coupling/DA–rDA reaction of 5,5′-bi-1,2,4-triazine-containing thiamacrocycles by Ławecka, Justyna, Karczmarzyk, Zbigniew, Wolińska, Ewa, Olender, Ewa, Branowska, Danuta, Rykowski, Andrzej

“…The synthesis of conformationally strained 2,2′-bipyridine thiamacrocycles 5, 6, 9, 10 and their chiral sulfoxides 11– 14 is elaborated using, (1)…”
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A novel one-pot synthesis of annulated 2,2′-bipyridine ligands by inverse electron demand Diels–Alder reaction of 5,5 ′-bi-1,2,4-triazines by Rykowski, Andrzej, Branowska, Danuta, Kielak, Joanna

“…The Diels–Alder reaction of 5,5′-bi-1,2,4-triazines with cyclic enamines in the absence of a solvent leads to a range of symmetrical, annulated…”
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Synthesis and structure of a novel mesomeric betaine 6,7-dimethyl-2H-pyrazolo[4,3-e]tetrazolo[4,5-b][1,2,4]triazine by Karczmarzyk, Zbigniew, Mojzych, Mariusz, Rykowski, Andrzej

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Sequential homo-coupling Diels–Alder/ retro Diels–Alder reaction of 5,5′-bi-1,2,4-triazine-containing thiamacrocycles as a new route to thiacrown ethers incorporating a 2,2′-bipyridine subunit by Ławecka, Justyna, Olender, Ewa, Piszcz, Paweł, Rykowski, Andrzej

“…A new route to thiacrown ethers 5a– d and 6a– d incorporating a 2,2′-bipyridine subunit is elaborated using, (1) homo-coupling of 1,2,4-triazine sulfides 3a– d…”
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A Convenient Approach to 16-, 19-, and 22-Membered 2,2′-Bipyridine Thiacrown Ethers and Their Conformation Preferences by Ławecka, Justyna, Karczmarzyk, Zbigniew, Wolińska, Ewa, Branowska, Danuta, Rykowski, Andrzej

“…A convenient, three‐step synthesis of 1:1 thiacrown ether macrocycles 5a–c containing a fused cyclopenteno[c]2,2′‐bipyridine subunit has been accomplished…”
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Configurational assignments of oximes derived from 5-formyl and 5-acyl-1,2,4-triazines by Rykowski, Andrzej, Guzik, Eliza, Makosza, Mieczyslaw, Holzer, Wolfgang

“…The configuration of (3‐substituted)‐1,2,4‐triazin‐5‐ylcarbaldoximes and (3‐substituted)alkyl‐1,2,4‐triazin‐5‐ylketoximes was determined by means of 1H‐nmr,…”
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6,6′-Dimethylsulfinyl-2,2′-bipyridine: crystal structure and Hirshfeld surface analysis by Rozycka-Sokolowska, Ewa, Marciniak, Bernard, Ławecka, Justyna, Bujnicki, Bogdan, Drabowicz, Jozef, Rykowski, Andrzej

“…The structure of 6,6′-dimethylsulfinyl-2,2′-bipyridine (1) has been determined by a single-crystal X-ray crystallography. This compound crystallizes in the…”
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The first approach to optically active 2,2′-bipyridine alkyl sulfoxides by Ławecka, Justyna, Bujnicki, Bogdan, Drabowicz, Józef, Rykowski, Andrzej

“…Method A: (+)-(8,8-dichlorocamphorylsulfonyl)oxaziridine; method B: modified Sharpless reagent. The synthesis of 6,6′-bis(alkylsulfanyl)-2,2′-bipyridines and…”
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S-Transalkylation/ring closing metathesis as a route to azathiamacrocycles incorporating 2,2′-bipyridine subunits by Branowska, Danuta, Buczek, Izabela, Kalińska, Katarzyna, Nowaczyk, Justyna, Rykowski, Andrzej

“…A new route to cyclophanes 6a, b incorporating 2,2′-bipyridine subunits has been elaborated using as the key steps (1) S-transalkylation of…”
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5,5′,6,6′-Tetramethyl-3,3′-bi-1,2,4-triazine by Wolińska, Ewa, Karczmarzyk, Zbigniew, Rykowski, Andrzej, Wysocki, Waldemar

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Structural characterization of 6,6′-bis(substituted)-5,5′-bi-1,2,4-triazines as potential N-heterocyclic ligands for the extraction of nuclear waste by Branowska, Danuta, Karczmarzyk, Zbigniew, Rykowski, Andrzej, Wysocki, Waldemar, Olender, Ewa, Urbańczyk-Lipkowska, Zofia, Kalicki, Przemysław

“…Novel disubstituted 5,5′-bi-1,2,4-triazines bearing pyridine (1), furan (2) and thiophene (3) rings at 6 and 6′-positions of the parent bitriazine were…”
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