Enol Ethers
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Synthesis of some fenchyl-substituted alkenes and enol-ethers containing 3-oxyphenyl substituents by the Barton-Kellogg reaction
Usando-se a reação de Barton-Kellogg, foram sintetizados um alceno e dois enóis-éteres fenchyl-substituídos, contendo grupos 3-oxifenila como substituintes. O fenchil-alceno aromático tri-substituído 1a foi preparado com rendimento de 53% a partir de tiofenchona e um diazoanisol. A abordagem inversa, baseada no acoplamento entre diazofenchona e tiono�
Journal of the Brazilian Chemical Society. Publicado em: 2010
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2. USING OF THE IONIC LIQUIDS IN THE SYNTHESIS OF ENONES AND ENAMINONES / UTILIZAÇÃO DE LÍQUIDOS IÔNICOS NA SÍNTESE DE ENONAS E DE ENAMINONAS
The use of ionic liquids 1-butyl-3-methylimidazolium tetrafluorborate ([BMIM] [BF4]) and 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) as catalytic solvent in the synthesis of 1,1,1-trichloro(fluoro)-3-alken-2-onas [CX3C(O)C(R2)=C(R1)OR] from the reaction of enolethers or acetals with acyl halides is reported. The results obtained in the pres
Publicado em: 2009
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3. USE OF MICROWAVE IRRADIATION IN THE SYNTHESIS OF ENONES AND 4,5-DIHYDRO-1H-PYRAZOLES TRIHALOMETHYL-SUBSTITUTED / USO DE ENERGIA MICROONDAS NA SÍNTESE DE ENONAS E DE 4,5-DIIDROPIRAZÓIS TRIALOMETIL-SUBSTITUÍDOS
The solvent-free microwave-assisted regiospecific synthesis of a series of 5-trihalomethyl-4,5-dihydro-1H-pyrazole (7 - 10) from the cyclocondensation of 1,1,1- trihalo-4-alkoxy-3-alken-2-ones (5 - 6),[ CX3COC(R)2=C(R)1OR, where X = Cl, F; R = Me, Et; R2 = H, Me and R1 = H, Me, Et, Pr, iso-Pr, Bu, iso-Bu, tert-Bu, iso - Pen, Ph, 4-Me-Ph, 4-MeO-Ph, 4-NO2-Ph,
Publicado em: 2008
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4. Reação de alfa -amidoalquilação de ions N-aciliminio com nucleofilos de carbono em sistema micelar SDS/agua, na ausencia de solvente e em liquido ionico : aplicação na sintese de um analogo da febrifugina / alfa -amidoalkylation of N-acyliminium ions with carbon nucleophiles in SDS/water, under solvent-free condition and in ionic liquid. Aplication to the synthesis of a febrifugine analog
Our work involved the formation of N-acyliminium ions, generated under the following reaction conditions: SDS/water micelles, solvent-free and in ionic liquido N-acyliminium ions were generated from the corresponding carbamates (N-Boc-2-methoxypyrrolidine and N-Boc-2-methoxypiperidine) with the aid of a Lewis or Bronsted acid catalyst. Both aqueous HCI and I
Publicado em: 2006
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5. Niobium Pentachloride as Lewis acid in [2 + 2] and [4 + 2] cycloadditions reactions / Pentacloreto de nióbio como ácido de Lewis em reações de cicloadição [2+2] e [4+2]
The aim of this work was to investigate the use of NbCl5 as Lewis acid in cycloadittion reactions. We have studied [2 + 2] cycloaddition reactions, Diels-Alder reactions between enonas and cyclopentadiene and aza-Diels-Alder reactions with Schiff bases. The effects of the temperature and of the molar concentration of NbCl5 were also evaluated. Comparasion of
Publicado em: 2006
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6. Studies on the dehydroiodination of cyclic beta-iodo-enol ethers
Este trabalho descreve a reação de desidroiodação, promovida por base, de uma série de beta-iodo-enol éteres cíclicos. Os produtos são tetraidrofuranos contendo duas ligações duplas exocíclicas, di- e tetraidrobenzofuranos e um derivado de diidropirano, todos obtidos em ótimos rendimentos.
Journal of the Brazilian Chemical Society. Publicado em: 2005-08
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7. Reações aldólicas assimétricas catalíticas
This review describes the use of catalytic asymmetric aldol reactions of silyl enol ethers and silyl (thio)ketene acetals with aldehydes (the Mukaiyama aldol reaction) in order to illustrate its synthetic utility. A variety of Lewis acid and basic reagents were employed for catalytic aldol reactions with high diastereo- and enantioselectivities. The origins
Química Nova. Publicado em: 2003-08
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8. Estudo da reação de arilação de Heck de enecarbamatos, enamidas e enoleteres endociclicos utilizando sais de diazonio
The Heck arylation of olefins with aryltriflates and arylhalides is a well-established synthetic methodology for C-C bond formation. The Heck arylation employing diazonium salts (Heck-Matsuda reaction) is a much less explored methodology but offers a number of advantages over the traditional Heck protocol. These advantages comprise its mildness, shorter reac
Publicado em: 2003
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9. A general assay for antibody catalysis using acridone as a fluorescent tag.
A simple and highly sensitive catalysis assay is demonstrated based on analyzing reactions with acridonetagged compounds by thin-layer chromatography. As little as 1 pmol of product is readily visualized by its blue fluorescence under UV illumination and identified by its retention factor (Rf). Each assay requires only 10 microliters of solution. The method
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10. Molecular mechanism of enantioselective proton transfer to carbon in catalytic antibody 14D9
Catalytic antibody 14D9 catalyzes the enantioselective protonation of prochiral enol ethers with high enantioselectivity (>99% ee) and a practical turnover (kcat = 0.4 s-1), allowing for preparative scale applications. This antibody represents one of the rare examples of catalytic antibodies promoting acid-catalyzed processes. Antibody 14D9 was cloned and ex
National Academy of Sciences.
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11. Antibody-catalyzed reversal of chemoselectivity.
A monoclonal antibody, 14D9, which has been elicited against a cationic hapten, N-alkyl-N-methyl-3-glutarylamidomethyl piperidinium, in which alkyl = [4-(2-hydroxyethylamido)carbonyl]phenylmethyl, is capable of inverting the intrinsic order of reactivity in a series of structurally related enol ethers and ketals towards hydrolysis. The order of reactivity of