Výsledky vyhledávání - "I. Z. Nurkhametova"

Fused polycyclic nitrogen-containing heterocycles 14. Intramolecular cyclization of 4-azidocarbonyl-2,5-diphenylthiazole. New route to isoquinoline derivatives

Autor: I. Z. Nurkhametova, Vakhid A. Mamedov, I. Kh. Rizvanov, Igor A. Litvinov, Ya. A. Levin, Aidar T. Gubaidullin

Publikováno v: Russian Chemical Bulletin. 54:445-448

Thermolysis of 2,5-diphenylthiazole-4-carboxylic acid azide is accompanied by intramolecular cyclization to form 2-phenyl-4-H-thiazolo[4,5-c]isoquinolin-5-one through intermediate 2,5-diphenylthiazol-4-yl isocyanate.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6dfd2e447f20ca7334e62c8df7b96f4a
https://doi.org/10.1007/s11172-005-0271-y

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Fused polycyclic nitrogen-containing heterocycles 13. Synthesis of 6-phenyl-2-phenylimino-6H-1,3,4-thiadiazine-5-carboxylic acid and its intermolecular cyclodehydration accompanied by sulfur extrusion to form dipyrazolo[1,5-a,1′,5′d]pyrazine

Autor: Ya. A. Levin, Igor A. Litvinov, I. Z. Nurkhametova, A. T. Gubaidullin, Vakhid A. Mamedov

Publikováno v: Russian Chemical Bulletin. 54:441-444

Condensation of methyl phenylchloropyruvate with 4-phenylthiosemicarbazide proceeds as the Bose reaction to form 5-methoxycarbonyl-6-phenyl-2-phenylimino-6H-1,3,4-thiadiazine, which is hydrolyzed to give carboxylic acid. In the presence of polyphosph

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1ee2e6b70af18f9d6ca4a618a2876ec9
https://doi.org/10.1007/s11172-005-0270-z

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Fused polycyclic nitrogen-containing heterocycles 11. 4-Hydroxy-3,5-diphenyl-2-phenyliminothiazolidines as new key compounds in the synthesis of thiazolo[3,4-a]quinoxaline derivatives

Autor: Vakhid A. Mamedov, V. N. Charushin, Aidar T. Gubaidullin, I. Z. Nurkhametova, Ya. A. Levin, Igor A. Litvinov, S. K. Kotovskaya

Publikováno v: Russian Chemical Bulletin. 53:2568-2576

A procedure was developed for the synthesis of thiazolo[3,4-a]quinoxaline derivatives based on a new strategy for construction of the pyrazine ring. The key step of the process involves the reaction of 4-hydroxy-3,5-diphenyl-2-phenyliminothiazolidine

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a63531a166c93125fdaf5b6ffd4ba0e2
https://doi.org/10.1007/s11172-005-0156-0

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Condensation of 4-hydroxy-2-thiazolines with 1,2-phenylenediamine as a novel effective route to thiazolo[3,4-a]quinoxalines

Autor: Sadao Tsuboi, Aidar T. Gubaidullin, Igor A. Litvinov, I. Z. Nurkhametova, Vakhid A. Mamedov

Publikováno v: Heterocycles. 63(8):1783-1792

Thiazolo[3,4-a]quinoxalin-4-ones were prepared in two steps starting from methyl phenylchloropyruvate using a new strategy for the construction of the ring system. A key step in this new method involves the reaction of 4-hydroxytetrahydrothiazoles wi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ff046bc9b4cf677eb150f79e9469d8f
https://ousar.lib.okayama-u.ac.jp/32963

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Fused Polycyclic Nitrogen-Containing Heterocycles: VIII. Friedel–Crafts Intramolecular Cyclization of 5-Phenylthiazole-4-carboxylic Acids—A New Route to Indeno[2,1-d]thiazoles

Autor: Igor A. Litvinov, Aidar T. Gubaidullin, Vakhid A. Mamedov, Ya. A. Levin, I. Z. Nurkhametova

Publikováno v: Russian Journal of Organic Chemistry. 40:534-542

Friedel–Crafts intramolecular cyclization in the presence of polyphosphoric acid of 2-substituted 5-phenylthiazole-4-carboxylic acids, which are obtained by alkaline hydrolysis of the corresponding esters, leads to indeno[2,1-d]thiazoles. According

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5afdd981584004152b31464597d65cec
https://doi.org/10.1023/b:rujo.0000036076.65278.fe

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3-Aryl-1-imino-4-oxo-4,5-dihydrothiazolo-[3,4a]quinoxalines. Retrosynthetic approach

Autor: A. A. Kalinin, Ya. A. Levin, A. T. Gubaidullin, Vakhid A. Mamedov, I. Z. Nurkhametova, I. A. Litvinov

Publikováno v: Chemistry of Heterocyclic Compounds. 35:1459-1473

Methods of constructing condensed tricyclic 3-aryl-l-imino-4-oxo-4,5-dihydrothiazolo[3,4-a] quinoxaline systems has been effected from 3-(α-chlorobenzyl)quinoxalin-2-ones through 3-(α-isothioreidobenzyl)-and 3-(α-thiocyanatobenzyl)quinoxalin-2-one

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c048036d32ee719a939c72bc2a30f273
https://doi.org/10.1007/bf02251823

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Competition of the Hantzsch and boese reactions in the interaction of 1-thiocarbamoylthiosemicarbazide and phenylchloropyruvic acid methyl ester

Autor: I. Z. Nurkhametova, Aidar T. Gubaidullin, Vakhid A. Mamedov, Igor A. Litvinov, Ya. A. Levin

Publikováno v: Chemistry of Heterocyclic Compounds. 35:1357-1363

1-Thiocarbamoylthiosemicarbazide, the synthetic equivalent of thiourea and thiosemicarbazide, reacts with phenylchoropyruvic acid methyl ester exclusively as thiourea (Hantzsch reaction) forming 2-hydrazo-4-methoxycarbonyl-5-phenylthiazole. Diacetyla

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bf6d3be524f21930147027d0aab27d48
https://doi.org/10.1007/bf02252009

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Derivatives of 4-carboxy-3,5-diphenyl-2-phenyliminothiazoline. Synthesis and mass spectral investigation

Autor: Yu. Ya. Efremov, Vakhid A. Mamedov, I. Kh. Rizvanov, I. Z. Nurkhametova, Ya. A. Levin

Publikováno v: Chemistry of Heterocyclic Compounds. 35:1364-1369

Methods have been developed for dehydrating the unusually stable intermediate products of the Hantzsch reaction of N,N′-diphenylthioureas with derivatives of phenylchloropyruvic acid, viz. 4-hydroxy-4-methoxy (diethylamino)carbonyl-3,5-diphenyl-2-p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c96890461a553dbd8e72fd57e3e79a73
https://doi.org/10.1007/bf02252010

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