Keto Esters
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Biotechnological Properties of Sponges from Northeast Brazil: Cliona varians as a Biocatalyst for Enantioselective Reduction of Carbonyl Compounds
To research the potential ability of whole marine sponges to act as biocatalysts, this paper describes for the first time the employment of whole Cliona varians sponge in the stereoselective reduction of prochiral a-keto esters and isatin to the corresponding chiral alcohols. The addition of D-fructose, D-glucose or sucrose remarkably increased the conversio
J. Braz. Chem. Soc.. Publicado em: 2019-01
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2. AvaliaÃÃo espectroscÃpica da substituiÃÃo sistemÃtica de molÃculas de Ãgua coordenadas por ligantes β-dicetonas em complexos com Ãons lantanÃdeos
In this work, lanthanide complexes with β-diketones (2,4-pentanedione and trifluoroacetylacetone) and β-keto esters (etil 4,4,4,-trifluoro-2,4- pentanedione) ligands have been synthesized. The complexes showed general formulas: [Ln(acac)(H2O)6]Cl2, [Ln(acac)2(H2O)4]Cl, [Ln(tfa)(H2O)6]Cl2, [Ln(tfa)2(H2O)4]Cl e [Ln(eta)2(H2O)4]Cl. The compounds were
Publicado em: 2008
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3. Adaptação de forno de microondas doméstico para realização de reações de transesterificação sob refluxo e catálise por argilas
The microwave oven became an important source of heating for many laboratory procedures including accelerating organic reactions. Reactions that require long reflux times can sometimes be carried out in a few hours or minutes in a conventional microwave oven. However, longer reflux times can be troublesome since domestic microwave ovens are not prepared for
Química Nova. Publicado em: 2006-04
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4. Rearrangement of beta,gamma-unsaturated esters with thallium trinitrate: synthesis of indans bearing a beta-keto ester moiety
O rearranjo de ésteres beta,gama-insaturados, tais como 2-(3,4-di-hidronaftalen-1-il)-propionato de etila, com trinitrato de tálio (TTN) em ácido acético leva a 3-indan-1-il-2-metil-3-oxo-propionatos de etila com bom rendimento, através de uma reação de contração de anel. Os novos indanos assim obtidos possuem uma unidade beta-ceto éster, a qual po
Journal of the Brazilian Chemical Society. Publicado em: 2006-02
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5. β-enamine esters as precursors of GABA and dihydropyridines analogues / bβ-enamino ésteres como precursores de análogos do GABA e de di-hidropiridinas
This thesis presents a study of iodo-cyclization of β-enamino esters in order to obtain conformationally restricted analogues of γ-amino butiric acid (GABA) and of 1,4-dihydropyridines (DHPs). Trisubstituted cyclopentanes were obtained from iodo-β-enamino esters and the mechanism of their formation was proposed and corroborated by (+)-ESI-MS/M
Publicado em: 2006
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6. USO DE K-10 E IRRADIAÇÃO DE MICROONDAS NO ESTUDO DA METODOLOGIA DE TRANSESTERIFICAÇÃO E NA SÍNTESE DE β-ENAMINO ÉSTERES / USE OF K-10 AND MICROWAVE IRRADIATION FOR THE TRANSESTERIFICATION AND SYNTHESIS OF β-ENAMINO ESTERS.
Devido à grande versatilidade química como precursores sintéticos, os β-cetoésteres e os compostos β-enamino carbonílicos, têm sido alvo de estudos em nosso grupo de pesquisa no desenvolvimento de metodologias para a síntese e reatividade desses compostos. Neste trabalho buscamos estabelecer metodologias para transesterificação de β-c
Publicado em: 2005
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7. Sintese quimioenzimatica de (-)- serricornina e (+)- sitofilure
Chiral alcohols are versatile and convenient building blocks in the synthesis of biologically important compounds. Asymmetric reduction of b-keto esters by Baker s yeast (S. cerevisiae) has been widely used to obtain chiral alcohols because of simplicity, cheapness and enantioselectivity. However, the optical purities and the yields of these compounds are of
Publicado em: 1997
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8. Estudo de reatividade na redução eletrolítica de alguns α-cetoesteres em metanol, com eletrodos de platina / Study of the reactivity of the electrolytic reduction of some α-ketoesters in methanol, with platinum electrodes
The present work describes the syntheses of some aliphatic and aromatic α-hydroxy - and α-keto-methyl esters and reports the electrolyses of the latter, in methanol, at a platinum cathode Some simple electrolytic experiments, varying the experimental conditions as well as those in which the transformations occurring during the electrolyses were fol
Publicado em: 1974
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9. Overexpression of Lactobacillus caseid-Hydroxyisocaproic Acid Dehydrogenase in Cheddar Cheese†
Metabolism of aromatic amino acids by lactic acid bacteria is an important source of off-flavor compounds in Cheddar cheese. Previous work has shown that α-keto acids produced from Trp, Tyr, and Phe by aminotransferase enzymes are chemically labile and may degrade spontaneously into a variety of off-flavor compounds. However, dairy lactobacilli can convert
American Society for Microbiology.
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10. Glycerophospholipid synthesis: improved general method and new analogs containing photoactivable groups.
Current methods for phospholipid synthesis involving acylation of sn-glycero-3-phosphorylcholine, lysolecithins, and related glycerophosphate esters are not satisfactory. With N,N-dimethyl-4-aminopyridine as a catalyst and moderate amounts of fatty acid anhydrides (1.2-1.5 mol equiv per OH group), diacyl or 1,2-mixed diacylphosphatidylcholines, N-protected p
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11. beta-Ketoadipate pathway in Trichosporon cutaneum modified for methyl-substituted metabolites.
Trichosporon cutaneum, when grown with p-cresol, catalyzed intradiol fission of the benzene nucleus of 4-methylcatechol before the complete catabolism of these two substrates. Steps in their conversion to pyruvate and acetyl coenzyme A were investigated by using cell extracts, and some properties of various new microbial catabolites are also described. These
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12. Differential low density lipoprotein receptor-dependent formation of eicosanoids in human blood-derived monocytes.
We studied the ability of low density lipoproteins (LDLs) to provide arachidonic acid (AA) for eicosanoid biosynthesis in human blood-derived monocytes. When incubated in the presence of reconstituted LDL that contained cholesteryl [1-14C]arachidonate (recLDL-[14C]AA-CE), resting monocytes formed three labeled products of the prostaglandin (PG) H synthase pa