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Общее количество найденных документов : 25
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 1-10    11-20   21-25 
1.
Инвентарный номер: нет.
   
   A 10


   
    A new approach to the synthesis of fluorinated chromones [Electronic resource] / V. I. Saloutin, I. T. Bazyl, Z. E. Skryabina, V. M. Krokhalev, O. N. Chupakhin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1992. - Vol. 41, N 9. - P1714-1715
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The condensation of two molecules of ethyl pentafluorobenzoylacetate gives 1-oxo-3-penta fluorophenyl-1H-pyrano[4,3-b]6,7,8,9-tetrafluorochrome

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1992, 41 (9), 1714.pdf
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2.
Инвентарный номер: нет.
   
   C 91


   
    Crystalline hydrogen-bonded adducts of dimethyl sulphoxide and 7-hydroxypolyfluoroquinolones (chromones [Text] / V. I. Saloutin, I. T. Bazyl, Z. E. Skryabina, G. G. Alexandrov, O. N. Chupakhin // Journal of Fluorine Chemistry. - 1995. - V. 74. - P15-19
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A stable crystalline hydrogen-bonded adduct of dimethyl sulphoxide (DMSO) and 7-hydroxy-5,6,8-trifluoro-2-carboxychromone has been prepared by the reaction of 2-carboxy-5,6,7,8-tetrafluorochromone with KOH/glycerol in DMSO. It has been found that pentafluorophenol and also 1-cyclohexyl-7-hydroxy-5,6,8-trifluoro-4(1H)-4-oxoquinoline-2-carboxylic acid form the corresponding crystalline hydrogen-bonded adducts with DMSO. The structure of the latter has been established from an X-ray crystallographic study

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3.
Инвентарный номер: нет.
   
   K 49


    Kisil', S. P.
    New Fluoroaryl-containing beta,beta'-Dioxoesters in the Synthesis of Fluorobenzopyran-2(4)-ones [Electronic resource] / S. P. Kisil', Ya. V. Burgart, V. I. Saloutin // Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2001. - Vol. 37, № 10. - P1455-1462
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: For the first time were obtained ethyl 2-(2-methoxy-3,4,5,6-tetrafluorobenzoyl)-3-oxobutanoate and ethyl 2-pentafluorobenzoyl-3-oxobutanoate and their copper chelates. The compounds were prepared by acylation of ethyl acetoacetate with 2-methoxy-3,4,5,6-tetrafluoro- and pentafluorobenzoyl chlorides. Cyclization of these ,'-dioxoesters afforded substituted chromones. 2-Methyl-5-methoxy-6,7,8-trifluoro-3-ethoxycarbonylchromone hydrolyzes depending on reaction conditions either to 5-hydroxy-2-methyl-6,7,8-trifluorochromone or to 5-hydroxy-2-methyl-6,7,8-trifluorochromone-3-carboxylic acid. Reaction with morpholine provided 7-substituted product, and with aqueous ammonia as a result of rearrangement forms 3-acetimidoyl-4-hydroxy-5-methoxy-6,7,8-trifluorocoumarin. Hydrolysis of the latter yields 3-acetyl-4-hydroxy-5-methoxy-6,7,8-triflu

\\\\Expert2\\nbo\\Russian Journal of Organic Chemistry\\2001, 37 (10), 1455.pdf
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4.
Инвентарный номер: нет.
   
   K 66


    Kodess, M. I.
    Reactions of 3-(polyfluoroacyl)chromones with hydroxylamine : synthesis of novel R - containing isoxazole and chromone derivatives [Electronic resource] / M. I. Kodess, V. Ya. Sosnovskikh, V. S. Moshkin // Tetrahedron. - 2008. - Vol. 64, № 34. - P7877-7889 : рис. - Библиогр. : с. 7888-7889 (32 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Reaction of 3-(polyfluoroacyl)chromones with hydroxylamine free base proceeds via nucleophilic 1,4-addition followed by opening of the pyrone ring and subsequent cyclization to 4-(polyfluoroalkyl)-4H-chromeno[3,4-d]isoxazol-4-ols in good yields. On treatment with trifluoroacetic acid, the isoxazole ring of this annulated heterocyclic system opens to give 3-cyano-2-(polyfluoroalkyl)chromones, which were successfully hydrolyzed with concentrated H2SO4 to afford 3-carbamoyl-2-(polyfluoroalkyl)chromones. On the other hand, oximation of 3-(polyfluoroacyl)chromones with hydroxylamine hydrochloride occurs either at the carbonyl carbon atom connected to the RF group or at the C-2 atom to give 3-RFC(NOH)-chromones and 5-RF-4-salicyloylisoxazole oximes, respectively. The former were easily converted to 3-RF-4-salicyloylisoxazoles by simple heating in dimethyl sulfoxide.??

\\\\Expert2\\nbo\\Tetrahedron\\2008, v. 64, N34, p. 7877.pdf
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5.
Инвентарный номер: нет.
   
   N 89


   
    Novel 3-acetyl-2-methyl-polyfluorochromones in reactions with amines and esters of amino acids [Electronic resource] / K. V. Shcherbakov, D. N. Bazhin, Ya. V. Burgart, V. I. Saloutin // Chemistry of Heterocyclic Compounds. - 2015. - Vol. 51, № 11/12. - С. 961-968. - Bibliogr. : p. 967-968 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
AMINE -- ACYLATION -- CHROMONE
Аннотация: Novel 3-acetyl-2-methyl-polyfluoro-4Н-chromen-4-ones were obtained via one-pot acylation of acetylacetone with polyfluorobenzoyl chlorides. These chromones were shown to form N-substituted 3-amino-1-[2-hydroxy(polyfluoro)phenyl]but-2-en-1-ones in reaction with aliphatic primary amines, esters of amino acids, and aqueous ammonia via opening of the pyrone ring and deacylation

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\2015, v.51, N 11-12, p. 961-968.pdf
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6.
Инвентарный номер: нет.
   
   N 89


   
    Novel chemical modifications at the 4-position of chromones. Synthesis and reactivity of 4H-chromene-4-spiro-5-isoxazolines and related compounds [Text] / V. Ya. Sosnovskikh, B. I. Usachev, A. Yu. Sizov, M. I. Kodess // Tetrahedron Letters. - 2004. - Vol. 45, № 39. - P7351-7354 : ил. - Библиогр.: с. 7353-7354 (22 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CHROMONES -- DILITHIOOXIMES -- 4H-CHROMENE-4-SPIRO-5'-ISOXAZOLINES; -- ALFA,BETA-UNSATURATED OXIMES -- BECKMANN REARRANGEMENT -- NITROSATION -- BROMINATION
Аннотация: Reactions of chromones with dilithiooximes proceed via nucleophilic 1,2-addition to give, on acidification, 4H-chromene-4-spiro-5-isoxazoline derivatives in high yields. On treatment with concentrated H2SO4 the isoxazoline ring of this novel spiroannulated heterocyclic system opens to give alfa,beta-unsaturated oximes, which undergo nitrosation, bromination, and the Beckmann rearrangement to the corresponding spiroisoxazolines and alfa,beta-unsaturated amides, respectively. The latter can be obtained directly by the Beckmann rearrangement of 4H-chromene-4-spiro-5`-isoxazolines

\\\\Expert2\\nbo\\Tetrahedron Letters\\2004, v. 45, p.7351.pdf
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7.
Инвентарный номер: нет.
   
   N 89


   
    Novel fluorinated chromones [Text] / V. I. Saloutin, Z. E. Skryabina, I. T. Bazyl, O. N. Chupakhin // Journal of Fluorine Chemistry. - 1993. - Vol. 65, N 1-2. - P37-41
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The self-condensation of ethyl pentafluorobenzoylacetate leads to the formation of 3-pentafluorophenyl-1H-sopyrono[2,3-b]-6,7,8,9-tetrafluorochrom in 37% yeld. On hydrolysis, this gave 2-pentafluorobenzoylmethyl-5,6,7,8-tetrafluorochromone

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8.
Инвентарный номер: нет.
   
   R 30


   
    Reaction of 2-(trifluoromethyl)chromones with pyridoxal: Formation of 1-benzopyranooxepino- and 1-benzopyranopyranopyridines / V. Ya. Sosnovskikh, V. Yu. Korotaev, A. Yu. Barkov, A. A. Sokovnina, M. I. Kodess // Journal of Fluorine Chemistry. - 2012. - Vol.141. - С. 58-63
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ALCOHOLIC HYDROXY GROUP -- PHENYL HYDROXY GROUP -- PYRIDOXAL
Аннотация: Pyridoxal undergoes oxa-Michael initiated ring closure with 2-(trifluoromethyl)chromones giving 11a,13-dihydro-6H-1-benzopyrano[3′,2′:6,7]oxepino[3,4-c]pyridin-6-ones and 6H,11aH-1-benzopyrano[3′,2′:5,6]pyrano[2,3-c]pyridin-6-ones. Participation of alcoholic hydroxy group of pyridoxal in the initial oxa-Michael addition leads to the former product and that of the phenyl hydroxy group to the later one

\\\\Expert2\\nbo\\Journal of Fluorine Chemistry\\2012, v. 141, p.58.pdf
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9.
Инвентарный номер: нет.
   
   R 30


   
    Reaction of 3-(polyfluoroacyl)chromones with hydrazines: new regioselective synthesis of RF-containing pyrazoles [Electronic resource] / V. Ya. Sosnovskikh, R. A. Irgashev, V. S. Moshkin, M. I. Kodess // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2008. - Vol. 57, № 10. - P2146-2155
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Reactions of 3-(polyfluoroacyl)chromones with hydrazine, methyl-and phenylhydrazines proceed by the mechanism of nucleophilic 1,4-addition with subsequent pyrone ring opening and heterocyclization at the polyfluoroacyl group to 4-(2-hydroxyaroyl)-3-polyfluoro-alkylpyrazoles or at the aroyl group to 4-polyfluoroalkyl-2,4-dihydrochromeno[4,3-c]pyrazol-4-ols. Regiochemistry of the products was established based on the data of 2D-experiments HSQC, HMBC, and NOESY and X-ray diffraction study

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2008, 57 (10), 2146.pdf
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10.
Инвентарный номер: нет.
   
   R 30


   
    Reaction of Polyhaloalkyl-Substituted Chromones, Pyrones, and Furanones with Salicylaldehydes as a Direct Route to Fused 2H-Chromenes [Text] : доклад, тезисы доклада / V. Ya. Sosnovskikh, V. Yu. Korotaev, D. L. Chizhov, I. B. Kutyashev, D. S. Yachevskii, V. N. Charushin // 18th ISFC international Symposium on Fluorine Chemistry. Bremen, 30th Jul.-4 Aug. 2006 г. : Final Program. Abstracts. - Bremen, 2006. - P307
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
GAMMA-RYRONES -- BETA-FURANONES

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