Центральная Научная Библиотека УрО РАН

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   S 73

    Sosnovskikh, V. Ya.
    2,3-dihidro-2,2-dimethyl-6-trifluoromethyl-4-pyrone as Useful CF3-containing Synthon [Text] : доклад, тезисы доклада / V. Ya. Sosnovskikh, M. Yu. Mel'nikov, Yu. G. Yatluk // International Memorial I.Postovsky Conference on Organic Chemisty, Ekaterinburg, March 17-20, 1998 : program and abstracts. - Ekaterinburg, 1998. - P94

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Рубрики: ХИМИЧЕСКИЕ НАУКИ

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   П 53


    Получение полифторированных простых эфиров [] / Д. Н. Бажин, Т. И. Горбунова, А. Я. Запевалов, В. И. Салоутин // Журнал прикладной химии. - 2005. - Т. 78, N 10. - 1674-1678: табл. - Библиогр. : с. 1678 (10 назв.) . - ISSN 0044-4618

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Исследованы методы синтеза простых полифторированных эфиров H(CF2CF2)n CH2OR на основе теломерных спиртов H(CF2CF2)nCH2OH (n=1-3) их алкилированием алкилгалогенидами и алкилтозилатами

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   S 98


    Synthesis and the reactions of trifluoromethylated 1,2,3-triketones 2-(het)arylhydrazones and 4,7-dihydroazolo[5,1-c]triazines [Electronic resource] / O. G. Khudina, E. V. Shchegol'kov, Ya. V. Burgart, M. I. Kodess, O. N. Kazheva, A. N. Chekhlov, G. V. Shilov, O. A. Dyachenko, V. I. Saloutin, O. N. Chupakhin // Journal of Fluorine Chemistry. - 2005. - Vol. 126, № 8. - P1230-1238

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The coupling of trifluoromethylated 1,3-diketones with (het)aryldiazonium chlorides results mainly in the formation of 1,2,3-triketones 2-(het)arylhydrazones while using hetarylamine with a NH-group at the ?-position of the heterocycle as the diazonium component gives 4,7-dihydroazolo[5,1-c]triazines due to cyclization at the trifluoroacetyl fragment. Trifluoromethylated 1,2,3-triketones 2-(het)arylhydrazones and 7-hydroxy-4,7-dihydroazolo[5,1-c]triazines react regio-selectively with methyl hydrazine and phenyl hydrazine to form 3-CF3-pyrazoles. The long-range coupling constants (JF-H) of 1-methylpyrazoles and the chemical shifts of trifluoromethyl groups in the 19F NMR spectra can be used for the determination of regio-isomeric structures of mono(trifluoromethyl)-substituted pyrazoles. 2-(Het)arylhydrazones and 4,7-dihydroazolo[5,1-c]triazines with two trifluoromethyl substituents afford the mixtures of cis- and trans-azopyrazoles in the reactions with hydrazines.

\\\\Expert2\\nbo\\Journal of Fluorine Chemistry\\2005, v.126, p.1230.pdf
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   N 89


    Novel polyfluoroalkylated pyrazoles from 2-polyfluoroacylcycloalkanones and hydrazines: Syntheses and unequivocal molecular structure assignment [Text] / D. V. Sevenard, O. G. Khomutov, M. I. Kodess, K. I. Pashkevich, I. Loop, E. Lork, G. -V. Roeschenthaler // Canadian Journal of Chemistry. - 2001. - Vol. 79, № 2. - P183-194

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
HYDRAZINES -- MOLECULAR STRUCTURE -- ISOMERIC PYRAZOLES;
Аннотация: The reaction between 2-trifluoroacetylcycloalkanones and methylhydrazine or phenylhydrazine exclusively yields 3-CF3-pyrazoles. When the chain length of the polyfluorinated substituent in RFC(O) group increases, 5-RF-pyrazoles are isolated. The reaction of 2-trifluoroacetylcyclohexanone with 2-hydrazinopyradine gives 5-hydroxypyrazoline, an intermediate in the formation of 5-CF3-pyrazoles. The regiochemistry of the condensation is probably controlled by the nucleophilicity of the terminal nitrogen in the mono substituted hydrazines and by the steric requirements of the RF group in the 1,3-diketones. Polymethylene chain containing pyrazoles obtained from the 1,3-diketones in question and hydrazine prefer the 3-RF tautomeric form, irrespective of carbocyclic ring size and polyfluoroalkyl group chain length.

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    (E)-1,1,1-trifluoro-4-phenyl-but-2-ene-4-one and trimethyl phosphite [Text] / V. G. Ratner, E. Lork, K. I. Pashkevich, G. -V. Roeschenthaler // Journal of Fluorine Chemistry. - 2000. - Vol. 102, № 1-2. - P73-77

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The interaction of (E)-1,1,1-trifluoro-4-phenyl-but-2-ene-4-one (1) with trimethyl phosphite affords in a [4 + 1] cycloaddition the 1,2?5-oxaphospholene 2 as a sole product which upon hydrolysis is transformed into the fluoroalkyl containing ?-ketophosphonate 4. When the reaction is carried out in the presence of small mounts of water, in addition to 2 as a main product, the phosphoric acid ester 6 of the enolic dimer of ketone 1 is also formed. The molecular structure of compound 6 (monoclinic P 2(1)/c with a = 2088.60(2), b = 1403.1(3), c = 1613.8(1) pm, ? = 90, ? = 100.97(1), ? = 90°, Z = 8) was determined, indicating two independent molecules with (RR) and (SS) configuration and disordered CF3 groups.????

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   C 52

    Chizhov, D. L.
    Reaction of trifluoromethylated beta-alkoxyenones with tris(trimethylsilyl) phosphite: A temperature influence on regioselectivity [Text] / D. L. Chizhov, G. -V. Roeschenthaler // Journal of Fluorine Chemistry. - 2006. - Vol. 127, № 2. - P235-239

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The interaction of tris(trimethylsilyl) phosphite (TMSO)3P and E-trifluoromethyl-alkoxyenones CF3C(O)CHCHOEt and CF3C(O)CHC(OMe)Me yielded mixtures of E-1,2- and Z-1,4-adducts, CF3C(OTMS)[P(O)(OTMS)2]CCH(OAlk)R 2 and CF3(OTMS)CCHCR(OAlk)[P(O)(OTMS)2] 3 where R and Alk = H and Me, or both Me. Conversion of these 1,2-adducts to 1,4-isomers was effected by increased temperature or by exposure to more tris(trimethylsilyl) phosphite. Acid hydrolysis of 2b (R and Alk = Me) gave ketophosphonic acid CF3C(OH)[P(O)(OH)2]CH2COMe in 88% yield, whereas hydrolysis of 2a (R = H and Alk = Et) with KOH in methanol gave CF3C(OH)[P(O)(OK)2]CHCHOEt in 37% yield. Acid hydrolysis of 3a (R = H and Alk = Et) and 3b (R and Alk = Me) gave phosphonic acid CF3C(OH)2CHCHP(O)(OH)2 in 82% yield and trifluoromethylated 1,2,5,4-oxaphosphol-3-en

\\\\Expert2\\nbo\\Journal of Fluorine Chemistry\\2006, v.127, p.235.pdf
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   C 73


    Condensation of fluoroalkyl-containing 1,2,3-trione 2-arylhydrazones with methylamine [Electronic resource] / E. V. Shchegol'kov, Ya. V. Burgart, P. A. Slepukhin, O. N. Kazheva, V. I. Saloutin // Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2007. - Vol. 43, № 12. - P1788-1796

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Fluoroalkyl-containing 1,2,3-trione 2-arylhydrazones react with methylamine in different ways, depending on the substrate structure. Arylhydrazones having a short fluoroalkyl substituent (RF = CF3, HCF2CF2) react at the carbonyl group adjacent to the nonfluorinated substituent to give 3-alkyl(aryl)-2-aryldiazenyl-3-methylamino-1-polyfluoroalkylprop-2-en-1-ones. Arylhydrazones with a long-chain fluoroalkyl group (RF = C3F7 and longer) and a bulky nonfluorinated group take up methylamine molecule at the carbonyl group linked to the fluorinated substituent, and the subsequent haloform reaction yields N-methyl-2-arylhydrazono-3-oxobutanamides. Both types of products are formed in reactions of methylamine with 1,2,3-triketone 2-arylhydrazones having a long fluoroalkyl group and methyl group at the other carbonyl group. Template condensation of fluoroalkyl-containing 1,2,3-trione 2-arylhydrazones with methylamine over Ni(II) template gives bis[3-alkyl(aryl)-1-polyfluoroalkyl-3-methylamino-2-aryldiazenylprop-2-en-1-onato-N,N?]-nickel(II), regardless of the size of the fluoroalkyl substituent. The same complexes and their copper analogs can be obtained by treatment of 3-alkyl(aryl)-2-aryldiazenyl-3-methylamino-1-polyfluoroalkylprop-2-en-1-ones with the corresponding metal salts

\\\\Expert2\\nbo\\Russian Journal of Organic Chemistry\\2007, 43 (12), 1788.pdf
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   S 98


    Synthesis of polyfluorinated ethers [Electronic resource] / D. N. Bazhin, T. I. Gorbunova, A. Ya. Zapevalov, V. I. Saloutin // Russian Journal of Applied Chemistry. - 2005. - Vol. 78, № 10. - P1646-1650. - Bibliogr. : p. 1650 (10 ref.)

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ETHERS -- POLYFLUORINATED ETHERS -- ALKYLATION -- TELOMERIC ALCOHOLS -- ALKYL HALIDES -- ALKYL TOSYLATES
Аннотация: Procedures for preparing polyfluorinated ethers H(CF2CF 2)nCH2OR by alkylation of the corresponding telomeric alcohols H(CF2CF2)nCH2OH (n = 1-3) with alkyl halides and alkyl tosylates were examined.

\\\\Expert2\\nbo\\Russian Journal of Applied Chemistry\\2005, v. 78, N. 10, p.1646.pdf
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   I-85


    Isomerization of monohydroperfluoroalkenes [Electronic resource] / T. I. Filyakova, A. Ya. Zapevalov, M. I. Kodess, M. A. Kurykin, L. S. German // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1994. - Vol. 43, № 9. - P1526-1531

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Isomerization of monohydroperfluoro-1-alkenes HC(CF2)nCF=CF2 (n = 2 to 8) catalyzed by Lewis bases or acids (CsF, KHF2, and SbF5) under conditions of thermodynamic control affords equilibrium mixtures of all of the possible isomers resulting from migration of the double bond along the carbon chain. Under conditions of kinetic control, isomerization through the action of SbF5 gives -H-perfluoro-2-alkenes. The substantially higher proportion ofcis-isomers in the resulting monohydroperfluoroalkenes than in their perfluorinated analogs has been attributed to the effect of an intramolecular hydrogen bond

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1994, 43 (9), 1526.pdf
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10.

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   M 38


    Mass spectrometry study of the pyrolysis of perfluoroolefin oxides [Electronic resource] / N. D. Kagramanov, A. A. Kutin, N. V. Peschanskii, A. Ya. Zapevalov, L. S. German // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1991. - Vol. 40, № 7. - P1321-1325

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The pyrolysis of perfluoroolefin oxides has been studied by gas chromatography/mass spectrometry at 400–700°C, in a current of He (110 dilution, contact time 1 sec). For oxides containing a terminal CF2 group, the sole degradation route is through the elimination of difluorocarbene. Pyrolysis of symmetrical disubstituted oxides results in the elimination of a perfluoroalkylfluorocarbene, which subsequently isomerizes to the corresponding perfluoroolefin. In the pyrolysis of unsymmetric disubstituted oxides the elimination of perfluoroalkylfluorocarbenes occurs by both of the possible routes. Trisubstituted oxides eliminate bis-perfluoroalkylcarbenes. The decomposition of tetrasubstituted oxides proceeds along several directions concurrently

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1991, 40 (7), 1321.pdf
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11.

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   S 73

    Sosnovskikh, V. Ya.
    Reaction of 3,3-dialkyl-6-trifluoromethyl-2,3-dihydro-4-pyrones with hydrazine hydrate [Electronic resource] / V. Ya. Sosnovskikh, M. Yu. Mel'nikov, M. I. Kodess // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1998. - Vol. 47, № 7. - P1365-1368

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: 3,3-Dialkyl-2,3-dihydro-6-trifluoromethyl-4-pyrones react with hydrazine hydrate to give 2-hydrazino-2-trifluoromethyl-4-tetrahydropyrone hydrazones. When heated, the latter are transformed into 3(5)-(2-hydroxyethyl)-5(3)-trifluoromethylpyrazoles, while their treatment with HCl in ether leads to 3,3-dialkyl-2,3-dihydro-6-trifluoromethyl-4-pyrone azines

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1998, 47 (7), 1365.pdf
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12.

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   C 74


    Complexes of crown ethers with perfluorocarboxylic acids and their thermal decarboxylation [Electronic resource] / A. V. Podol'skii, T. G. Khonina, O. V. Koryakova, M. I. Kodess // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1993. - Vol. 42, № 6. - P1052-1055

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Crown ethers form strong proton-acceptor complexes with CF3COOH or C4F9COOH that undergo thermal decarboxylation at 200–260 °C which results in 60–80% of CF3H or C4F9H (including up to 20 % of a mixture of C4F8). Critical parameters of the process were determined in relation to the temperature and amount of crown ether. The relative activities of different crown ethers in decarboxylation were also established. A scheme is proposed that explains the effect of the structure of crown ethers on this reaction. The data obtained substantiate the view that the topological correspondence concept is insufficient to explain the ability of crown ethers to form complexes with cat

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1993, 42 (6), 1052.pdf
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13.

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   A 53


    An efficient synthesis of alkylfluoroalkylketones [Text] / O. G. Khomutov, V. I. Filyakova, A. V. Kutchin, K. I. Pashkevich // Journal of Fluorine Chemistry. - 1992. - Vol. 58, № 2-3. - P161

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Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Interaction of fluoroacyl chlorides with lithium tetraalkylaluminates II prepared by the hydroalumination of alkenes I results in fluorinated ketones III with yields of 65–70%.??RF = CF3, H(CF2)2, C4F9, C6F13 R1 = C3H7, C4H9, C6H13, C7H15??The reaction is simple and does not require an argon atmosphere, as is needed for most reactions of organoaluminum compounds????

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14.

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   D 53


    Diastereoselective reactions of 1,1,1-trichloro(trifluoro)-3-nitrobut-2-enes with 2-morpholinoalk-1-enes [Electronic resource] / V. Yu. Korotaev, A. Yu. Barkov, P. A. Slepukhin, M. I. Kodess, V. Ya. Sosnovskikh // Mendeleev Communications. - 2011. - Vol. 21, № 2. - P112-114. - Bibliogr. : p. 114 (12 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Reactions of (E)-1,1,1-trichloro(trifluoro)-3-nitrobut-2-enes with 3,3-dimethyl-2-morpholinobutene in benzene give (4R*,6R*)-6-tert-butyl-3-methyl-6-morpholino-4-trihalomethyl-5,6-dihydro-4H-1,2-oxazine 2-oxides. In a dichloromethane solution, these cyclic nitronates undergo diastereoselective ring opening to produce nitroalkylated anti-CCl3- and syn-CF3-enamines, which are hydrolysed with dilute HCl to afford the respective anti-CCl3- and syn-CF3-g-nitroketones

\\\\Expert2\\nbo\\Mendeleev Communications\\2011, v.21, p.112.pdf
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15.

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   С 87


    Структура и абсорбционные спектры замещенных 2-гидрокси-2-трифторметилхроман-4-онов / Л. А. Хамидуллина, И. С. Пузырев, А. В. Пестов, В. С. Мошкин, Ю. Г. Ятлук // Журнал прикладной спектроскопии. - 2012. - Т.79, №4. - С. 527-532. - Библиогр.: с. 532 (24 назв.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СПЕКТР ПОГЛОЩЕНИЯ -- КОЭФФИЦИЕНТ ЭКСТИНКЦИИ -- СРЕДА КИСЛОТНАЯ
Аннотация: Изучены спектры поглощения замещенных 2-гидрокси-2-трифторметил-хроман-4-онов (хроманонов) в УФ области в растворителе вода-этиленгликоль. Показано, что замещение водорода в ароматическом кольце хроманонов на CH3- и CF3-группы ведет к изменению коэффициентов экстинкцкии K-полосы с 16160 до 27980 и 30250 дм3/моль ⋅ см соответственно, B-полосы - с 12750 до 17920 и 16130 дм3/моль ⋅ см, полосы С=О - с 3850 до 3630 и 2760 дм3/моль ⋅ см. Изменение pH среды от 1 до 10.5 слабо влияет на полосы ароматического кольца, однако оказывает значительное влияние на полосу карбонильной группы исследуемых хроманонов: происходит сдвиг λmax от 311-326 до 342-346 нм. Также при этом возрастают коэффициенты экстинкции от 2760-3850 до 9940-10160 дм3/моль ⋅ см. Дальнейшее повышение pH приводит к гипохромии карбонильной полосы вследствие разложения хроманонов. Полученные данные подтверждены методами ЯМР-спектроскопии и газожидкостной хроматографии

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16.

Инвентарный номер: нет.

   S 89


    Structure and absorption spectra of substituted 2-hydroxy-2-trifluoromethylchroman-4-ones / L. A. Khamidullina, I. S. Puzyrev, A. V. Pestov, V. S. Moshkin, Yu. G. Yatluk // Journal of Applied Spectroscopy. - 2012. - Vol.79, №4. - С. 509-514

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ABSORPTION SPECTRA -- EXTINCTION COEFFICIENT -- MEDIUM ACIDITY
Аннотация: UV absorption spectra of substituted 2-hydroxy-2-trifluoromethylchroman-4-ones (chromanones) in aqueous ethyleneglycol were studied. Replacement of hydrogen in the aromatic ring of the chromanones by CH3 or CF3 groups was shown to cause the molar extinction coefficients of the K, B, and C=O bands to shift from 16,160 to 27,980 and 30,250 dm(3)/mol center dot cm; from 12,750 to 17,920 and 16,130 dm(3)/mol center dot cm; and from 3850 to 3630 and 2760 dm(3)/mol center dot cm, respectively. Increasing the solution pH from 1 to 10.5 affected weakly the aromatic ring bands yet impacted greatly the chromanone carbonyl bands, causing their lambda(max) to shift from 311-326 nm to 342-346 nm and their extinction coefficients to increase from 2760-3850 dm(3)/mol center dot cm to 9940-10,160 dm(3)/mol center dot cm. A further rise in the pH resulted in hypochromia of the carbonyl band due to the destruction of the chromanones. The results were confirmed by NMR spectroscopy and GC methods

\\\\Expert2\\nbo\\Journal of Applied Spectroscopy\\2012, v. 90, p.1176.pdf
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17.

Инвентарный номер: нет.

   S 98


    Synthesis of new fluorine-containing pyrazolo[3,4-b]pyridinones [Electronic resource] / K. S. Rodygin, S. A. Rubtsova, P. A. Slepukhin, A. V. Kuchin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2011. - Vol.60, №4. - С. 733-745. - Bibliogr. : p. 745 (28 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
MICROWAVE IRRADIATION -- AMINOPYRAZOLES -- ARYLSULFANYL(DIFLUORO)METHYL GROUP
Аннотация: Methods for the synthesis of 4 R 6,7 dihydro 1H pyrazolo[3,4 b]pyridin 6 ones (R = CF2SAr and 4 CFHSAr) were developed. The derivatives with R = CF2SAr were ob tained by both heterocyclization of 1 substituted 5 aminopyrazoles with ethyl 4,4 difluoro 3 oxo 4 phenylsulfanylbutanoate and replacement of the Br atom in 4 bromodifluoromethyl 6,7 dihydro 1H pyrazolo[3,4 b]pyridin 6 ones by sodium arenethiolates. The fragment 4 CF HSAr was introduced by replacement of the Cl atom in 4 chlorofluoromethyl 6,7 dihydro 1H pyrazolo[3,4 b]pyridin 6 ones by sodium arenethiolates. Oxidation of 4 CF2SPh 6,7 dihydro 1H pyrazolo[3,4 b]pyridin 6 ones gave the corresponding sulfoxides; their structures were con firmed by X ray diffraction data

\\\\expert2\\NBO\\Russian Chemical Bulletin\\2011, 60 (4), 733-745.pdf
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18.

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   А 72


    Антифрикционные свойства фторсодержащих сложных эфиров полиолов / Т. И. Горбунова, Д. Н. Бажин, А. Я. Запевалов, Л. Г. Коршунов, И. В. Бекетов, В. И. Салоутин // Фторные заметки. - 2012. - №1. - Библиогр.: с. (29 назв.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДОБАВКИ К СМАЗОЧНЫМ МАСЛАМ -- КОЭФФИЦИЕНТ ТРЕНИЯ -- ИНТЕНСИВНОСТЬ ИЗНАШИВАНИЯ -- НАНОРАЗМЕРНЫЙ ПОРОШОК МЕДИ
Аннотация: Синтезированы равновесные смеси фторсодержащих сложных эфиров на основе полиолов: триметилолпропана, неопентилгликоля и полиэтиленгликоля (ПЭГ-1000). Полученные продукты использованы в качестве добавок (1 мас. %) к индустриальным маслам. Установлено, что наибольший вклад в улучшение антифрикционных свойств минерального масла вносит добавка смесей эфиров с полифтороксаалкильным заместителем C3F7OCF(CF3)CF2OCF(CF3). Обсуждены некоторые аспекты возможной адсорбции фторсодержащих сложных эфиров на стальной поверхности. Все равновесные смеси синтезированных эфиров являются перспективными стабилизаторами суспензий наноразмерного порошка меди (1 мас. %) в индустриальном масле. Полученные суспензии улучшают противоизносные свойства аустенитной хромсодержащей стали

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19.

Инвентарный номер: нет.

   A 10


    A concise approach to CF3-containing furan-3-ones, (bis)pyrazoles from novel fluorinated building blocks based on 2,3-butanedione [Electronic resource] / D. N. Bazhin, G. -V. Roeschenthaler, D. L. Chizhov, Yu. S. Kudyakova, Ya. V. Burgart, P. A. Slepukhin, V. I. Saloutin, V. N. Charushin // Tetrahedron Letters. - 2014. - Vol. 55. - С. 5714-5717. - Bibliogr. : p. 5717 (16 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ClISEN CONDENSATION -- AKOXYENONES; -- TRIFLUOROACETYLATION
Аннотация: 1,1,1-Trifluoro-4,5,5-trimethoxyhex-3-en-2-one and lithium (2Z)-1,1,1-trifluoro-5,5-dialkoxy-4-oxohex-2-en-2-olate were synthesized for the first time via direct trifluoroacetylation of 2,3-butanedione acetal derivatives. A simple and effective approach to acetal or acyl substituted CF3-pyrazoles, 5,5′-bis(trifluoromethyl)-3,3′-bipyrazole, and, to 5-trifluoromethylfuran-3-ones is presented.

\\\\expert2\\nbo\\Tetrahedron Letters\\2014, v. 55, p. 5714.pdf
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20.

Инвентарный номер: нет.

   A 10


    A Convenient Approach to CF3-Containing N-Heterocycles Based on 2-Methoxy-2-methyl-5-(trifluoromethyl)furan-3(2H)-one [Electronic resource] / D. N. Bazhin, Yu. S. Kudyakova, G. -V. Roeschenthaler, Ya. V. Burgart, P. A. Slepukhin, M. L. Isenov, V. I. Saloutin, V. N. Charushin // European Journal of Organic Chemistry. - 2015. - № 23. - С. 5236-5245. - Bibliogr. : p. 5245 (23 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
NITROGEN HETEROCYCLES -- FLUORINE -- OXYGEN HETEROCYCLES
Аннотация: New synthetic routes to trifluoromethylated N-heterocycles based on condensations of 2-methoxy-2-methyl-5-(trifluoromethyl)furan-3(2H)-one with bifunctional N-nucleophiles are described. For the first time, trifluoromethyl-containing pyrazoles, pyrazolines and isoxazolines bearing hydrazone or oxime groups could be obtained by a one-pot strategy based on reactions of 5-(trifluoromethyl)furan-3(2H)-one with two equivalents of the corresponding hydrazines or hydroxylamine in the presence of an acid. The interaction of furan-3(2H)-one with ureas proceeded under mild conditions to furnish 1H-furo[2,3-d]imidazol-2(3H)-one derivatives in good yield. Further, a trifluoromethyl-containing quinoxaline derivative was obtained by condensation of furan-3(2H)-one with ortho-phenylenediamine.

\\\\expert2\\nbo\\European Journal of Organic Chemistry\\2015, №23. p.5236-5245.pdf
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