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Letteratura scientifica selezionata sul tema "Amides"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 21 settembre 2024

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Articoli di riviste sul tema "Amides"

Soong, Chee-Leong, Jun Ogawa e Sakayu Shimizu. "A Novel Amidase (Half-Amidase) for Half-Amide Hydrolysis Involved in the Bacterial Metabolism of Cyclic Imides". Applied and Environmental Microbiology 66, n. 5 (1 maggio 2000): 1947–52. http://dx.doi.org/10.1128/aem.66.5.1947-1952.2000.

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ABSTRACT A novel amidase involved in bacterial cyclic imide metabolism was purified from Blastobacter sp. strain A17p-4. The enzyme physiologically functions in the second step of cyclic imide degradation, i.e., the hydrolysis of monoamidated dicarboxylates (half-amides) to dicarboxylates and ammonia. Enzyme production was enhanced by cyclic imides such as succinimide and glutarimide but not by amide compounds which are conventional substrates and inducers of known amidases. The purified amidase showed high catalytic efficiency toward half-amides such as succinamic acid (Km = 6.2 mM; k cat = 5.76 s−1) and glutaramic acid (Km = 2.8 mM;k cat = 2.23 s−1). However, the substrates of known amidases such as short-chain (C2 to C4) aliphatic amides, long-chain (above C16) aliphatic amides, amino acid amides, aliphatic diamides, α-keto acid amides, N-carbamoyl amino acids, and aliphatic ureides were not substrates for the enzyme. Based on its high specificity toward half-amides, the enzyme was named half-amidase. This half-amidase exists as a monomer with an M r of 48,000 and was strongly inhibited by heavy metal ions and sulfhydryl reagents.

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Barham, Joshua P., e Jaspreet Kaur. "Site-Selective C(sp3)–H Functionalizations Mediated by Hydrogen Atom Transfer Reactions via α-Amino/α-Amido Radicals". Synthesis 54, n. 06 (25 ottobre 2021): 1461–77. http://dx.doi.org/10.1055/a-1677-6619.

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AbstractAmines and amides, as N-containing compounds, are ubiquitous in pharmaceutically-active scaffolds, natural products, agrochemicals, and peptides. Amides in nature bear a key responsibility for imparting three-dimensional structure, such as in proteins. Structural modifications to amines and amides, especially at their positions α to N, bring about profound changes in biological activity oftentimes leading to more desirable pharmacological profiles of small drug molecules. A number of recent developments in synthetic methodology for the functionalizations of amines and amides omit the need of their directing groups or pre-functionalizations, achieving direct activation of the otherwise relatively benign C(sp3)–H bonds α to N. Among these, hydrogen atom transfer (HAT) has proven a very powerful platform for the selective activation of amines and amides to their α-amino and α-amido radicals, which can then be employed to furnish C–C and C–X (X = heteroatom) bonds. The abilities to both form these radicals and control their reactivity in a site-selective manner is of utmost importance for such chemistries to witness applications in late-stage functionalization. Therefore, this review captures contemporary HAT strategies to realize chemo- and regioselective amine and amide α-C(sp3)–H functionalization, based on bond strengths, bond polarities, reversible HAT equilibria, traceless electrostatic-directing auxiliaries, and steric effects of in situ-generated HAT agents.1 Introduction2 Functionalizations of Amines3 Functionalizations of Carbamates4 Functionalizations of Amides5 Conclusion

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Zhou, Yongyun, Ruhima Khan, Baomin Fan e Lijin Xu. "Ruthenium-Catalyzed Selective Reduction of Carboxylic Esters and Carboxamides". Synthesis 51, n. 12 (30 aprile 2019): 2491–505. http://dx.doi.org/10.1055/s-0037-1611524.

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Amines and alcohols are important classes of building blocks in organic synthesis. The synthesis of these compounds has been a topic of interest. A straightforward method for their synthesis is the reduction of esters and amides to alcohols and amines, respectively. Various transition-metal catalysts have been developed for the homogeneous hydrogenation of esters and amides to alcohols and amines. In this review, an overview of the ruthenium-catalyzed selective hydrogenation of esters and amides is provided.1 General Introduction2 Ru-Catalyzed Reduction of Esters3 Ru-Catalyzed Selective Reduction of Amides4 Conclusions

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Zarecki, Adam P., Jacek L. Kolanowski e Wojciech T. Markiewicz. "Microwave-Assisted Catalytic Method for a Green Synthesis of Amides Directly from Amines and Carboxylic Acids". Molecules 25, n. 8 (11 aprile 2020): 1761. http://dx.doi.org/10.3390/molecules25081761.

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Amide bonds are among the most interesting and abundant molecules of life and products of the chemical pharmaceutical industry. In this work, we describe a method of the direct synthesis of amides from carboxylic acids and amines under solvent-free conditions using minute quantities of ceric ammonium nitrate (CAN) as a catalyst. The reactions are carried out in an open microwave reactor and allow the corresponding amides to be obtained in a fast and effective manner when compared to other procedures of the direct synthesis of amides from acids and amines reported so far in the literature. The amide product isolation procedure is simple, environmentally friendly, and is performed with no need for chromatographic purification of secondary amides due to high yields. In this report, primary amines were used in most examples. However, the developed procedure seems to be applicable for secondary amines as well. The methodology produces a limited amount of wastes, and a catalyst can be easily separated. This highly efficient, robust, rapid, solvent-free, and additional reagent-free method provides a major advancement in the development of an ideal green protocol for amide bond formation.

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Orsy, György, Sayeh Shahmohammadi e Enikő Forró. "A Sustainable Green Enzymatic Method for Amide Bond Formation". Molecules 28, n. 15 (28 luglio 2023): 5706. http://dx.doi.org/10.3390/molecules28155706.

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A sustainable enzymatic strategy for the preparation of amides by using Candida antarctica lipase B as the biocatalyst and cyclopentyl methyl ether as a green and safe solvent was devised. The method is simple and efficient and it produces amides with excellent conversions and yields without the need for intensive purification steps. The scope of the reaction was extended to the preparation of 28 diverse amides using four different free carboxylic acids and seven primary and secondary amines, including cyclic amines. This enzymatic methodology has the potential to become a green and industrially reliable process for direct amide synthesis.

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Martinez-Rodríguez, Sergio, Rafael Contreras-Montoya, Jesús M. Torres, Luis Álvarez de Cienfuegos e Jose Antonio Gavira. "A New L-Proline Amide Hydrolase with Potential Application within the Amidase Process". Crystals 12, n. 1 (23 dicembre 2021): 18. http://dx.doi.org/10.3390/cryst12010018.

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L-proline amide hydrolase (PAH, EC 3.5.1.101) is a barely described enzyme belonging to the peptidase S33 family, and is highly similar to prolyl aminopeptidases (PAP, EC. 3.4.11.5). Besides being an S-stereoselective character towards piperidine-based carboxamides, this enzyme also hydrolyses different L-amino acid amides, turning it into a potential biocatalyst within the Amidase Process. In this work, we report the characterization of L-proline amide hydrolase from Pseudomonas syringae (PsyPAH) together with the first X-ray structure for this class of L-amino acid amidases. Recombinant PsyPAH showed optimal conditions at pH 7.0 and 35 °C, with an apparent thermal melting temperature of 46 °C. The enzyme behaved as a monomer at the optimal pH. The L-enantioselective hydrolytic activity towards different canonical and non-canonical amino-acid amides was confirmed. Structural analysis suggests key residues in the enzymatic activity.

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Khalimon, Andrey, Kristina Gudun e Davit Hayrapetyan. "Base Metal Catalysts for Deoxygenative Reduction of Amides to Amines". Catalysts 9, n. 6 (28 maggio 2019): 490. http://dx.doi.org/10.3390/catal9060490.

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The development of efficient methodologies for production of amines attracts significant attention from synthetic chemists, because amines serve as essential building blocks in the synthesis of many pharmaceuticals, natural products, and agrochemicals. In this regard, deoxygenative reduction of amides to amines by means of transition-metal-catalyzed hydrogenation, hydrosilylation, and hydroboration reactions represents an attractive alternative to conventional wasteful techniques based on stoichiometric reductions of the corresponding amides and imines, and reductive amination of aldehydes with metal hydride reagents. The relatively low electrophilicity of the amide carbonyl group makes this transformation more challenging compared to reduction of other carbonyl compounds, and the majority of the reported catalytic systems employ precious metals such as platinum, rhodium, iridium, and ruthenium. Despite the application of more abundant and environmentally benign base metal (Mn, Fe, Co, and Ni) complexes for deoxygenative reduction of amides have been developed to a lesser extent, such catalytic systems are of great importance. This review is focused on the current achievements in the base-metal-catalyzed deoxygenative hydrogenation, hydrosilylation, and hydroboration of amides to amines. Special attention is paid to the design of base metal catalysts and the mechanisms of such catalytic transformations.

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Fournand, David, Frederic Bigey e Alain Arnaud. "Acyl Transfer Activity of an Amidase from Rhodococcussp. Strain R312: Formation of a Wide Range of Hydroxamic Acids". Applied and Environmental Microbiology 64, n. 8 (1 agosto 1998): 2844–52. http://dx.doi.org/10.1128/aem.64.8.2844-2852.1998.

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ABSTRACT The enantioselective amidase from Rhodococcus sp. strain R312 was produced in Escherichia coli and was purified in one chromatographic step. This enzyme was shown to catalyze the acyl transfer reaction to hydroxylamine from a wide range of amides. The optimum working pH values were 7 with neutral amides and 8 with α-aminoamides. The reaction occurred according to a Ping Pong Bi Bi mechanism. The kinetic constants demonstrated that the presence of a hydrophobic moiety in the carbon side chain considerably decreased the K m amide values (e.g.,K m amide = 0.1 mM for butyramide, isobutyramide, valeramide, pivalamide, hexanoamide, and benzamide). Moreover, very high turnover numbers (k cat) were obtained with linear aliphatic amides (e.g.,k cat = 333 s−1 with hexanoamide), whereas branched-side-chain-, aromatic cycle- or heterocycle-containing amides were sterically hindered. Carboxylic acids, α-amino acids, and methyl esters were not acyl donors or were very bad acyl donors. Only amides and hydroxamic acids, both of which contained amide bonds, were determined to be efficient acyl donors. On the other hand, the highest affinities of the acyl-enzyme complexes for hydroxylamine were obtained with short, polar or unsaturated amides as acyl donors (e.g.,K m NH2OH = 20, 25, and 5 mM for acetyl-, alanyl-, and acryloyl-enzyme complexes, respectively). No acyl acceptors except water and hydroxylamine were found. Finally, the purified amidase was shown to bel-enantioselective towards α-hydroxy- and α-aminoamides.

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Ding, Wen, Shaoyu Mai e Qiuling Song. "Molecular-oxygen-promoted Cu-catalyzed oxidative direct amidation of nonactivated carboxylic acids with azoles". Beilstein Journal of Organic Chemistry 11 (11 novembre 2015): 2158–65. http://dx.doi.org/10.3762/bjoc.11.233.

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A copper-catalyzed oxidative direct formation of amides from nonactivated carboxylic acids and azoles with dioxygen as an activating reagent is reported. The azole amides were produced in good to excellent yields with a broad substrate scope. The mechanistic studies reveal that oxygen plays an essential role in the success of the amidation reactions with copper peroxycarboxylate as the key intermediate. Transamidation occurs smoothly between azole amide and a variety of amines.

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Krieck, Sven, Philipp Schüler, Jan Peschel e Matthias Westerhausen. "Straightforward One-Pot Syntheses of Silylamides of Magnesium and Calcium via an In Situ Grignard Metalation Method". Synthesis 51, n. 05 (13 dicembre 2018): 1115–22. http://dx.doi.org/10.1055/s-0037-1610407.

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Calcium bis[bis(trimethylsilyl)amide] (Ca(HMDS)2) is a widely used reagent in diverse stoichiometric and catalytic applications. These processes necessitate a straightforward and large-scale access of this complex. Calcium does not react with primary and secondary amines, but the addition of excess bromoethane to a mixture of calcium turnings and amines in THF at room temperature yields the corresponding calcium bis(amides), calcium bromide and ethane. This in situ Grignard metalation method (iGMM) allows the preparation of calcium bis(amides) from secondary and primary trialkylsilyl-substituted amines and anilines on a multigram scale.1 Background2 The In Situ Grignard Metalation Method (iGMM)3 Properties of [(thf)2M(HMDS)2]4 Applications and Perspective

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Più fonti

Tesi sul tema "Amides"

Kargina, Irina. "Topochemical reactions of amines and amides with titanium and vanadium oxychlorides". Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10109.

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The intercalation of primary, secondary, tertiary, and aromatic amines into layered TiOCl have been investigated by a variety of methods. The intercalation reaction does not appear to be a redox process. A key step for intercalation of amines into host TiOCl is proposed to be a coordination via nitrogen lone electron pair to Ti$\sp{3+}$ metal centres. Subsequent substitution of the interlayer chloride ions of TiOCl by the amine molecules is strongly dependent on the properties of the organic compounds and their ability to form ammonium salts. Based on X-ray diffraction, fluorescence, elemental analysis and thermal analysis, a model for the interaction of amines with TiOCl is proposed. The intercalation of primary, secondary, and tertiary amides into TiOCl and VOCl have been studied. A redox intercalation process is ruled out by using variety of amides with a range of redox potentials. The proposed interaction of intercalated amides with the host is different from that of amines and may dominated by formation of hydrogen bonds between the amides protons and Cl ions of the host.

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Rofouei, Mohammad Kazem. "The preparation, characterisation and reactivity of derivatives of a novel sterically demanding amido ligand". Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361401.

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Li, Haiying. "A study on grafting poly(p-phenylene terephthalamide) with aliphatic amines and amides". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/8594.

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Muller, Catherine R. "Lithium amides in synthesis". Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413176.

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Richardson, J. "Corrosion inhibition with amides". Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381056.

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Ledingham, Lyndsay A. "Sustainable methods for the chemical synthesis of amides and amide-containing aromatic compounds". Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/16191/.

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Described in this thesis is work based on silica and palladium catalysis which focusses on the formation of amide-containing compounds. Efforts were made towards expanding the substrate scope of direct amide bond formation reactions catalysed by an activated K60 silica catalyst. Two of the resulting amides were then investigated as substrates in single and oxidative C–H functionalisation reactions to form phenanthridin-6(5H)-ones.

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Lauck, Maximilian Thomas Johannes [Verfasser]. "Cobaltocenium Amides - Photoinduced Electron Transfer Processes in Donor-Acceptor Amides / Maximilian Thomas Johannes Lauck". Mainz : Universitätsbibliothek Mainz, 2020. http://d-nb.info/1205943900/34.

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Farrell, Emma K. "Biosynthesis of fatty acid amides". Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/1629.

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Primary fatty acid amides (PFAMs) and N-acylglycines (NAGs) are important signaling molecules in the mammalian nervous system, binding to many drug receptors and demonstrating control over sleep, locomotor activity, angiogenesis, vasodilatation, gap junction communication, and many other processes. Oleamide is the best-studied of the PFAMs, while the in vivo activity of the others is largely unstudied. Even less is known about the NAGs, as their discovery as novel compounds is much more recent due to low endogenous levels. Herein is described extraction and quantification techniques for PFAMs and NAGs in cultured cells and media using solvent extraction combined with solid phase extraction (PFAM) or thin layer chromatography (NAG), followed by gas chromatography-mass spectroscopy to isolate and quantify these lipid metabolites. The assays were used to examine the endogenous amounts of a panel of PFAMs as well as the conversion of corresponding free fatty acids (FFAs) to PFAMs over time in several cell lines. The cell lines demonstrated the ability to convert all FFAs, including a non-natural FFA, and an ethanolamine to the corresponding PFAM. Different patterns of relative amounts of endogenous and FFA-derived PFAMs were observed in the cell lines tested. Essential to identifying therapeutic targets for the many disorders associated with PFAM signaling is understanding the mechanism(s) of PFAM and NAG biosynthesis. Enzyme expression studies were conducted to determine potential metabolic enzymes in the model cell lines in an attempt to understand the mechanism(s) of PFAM biosynthesis. It was found that two of the cell lines which show distinct metabolisms of PFAMs also demonstrate unique enzyme expression patterns, and candidate enzymes proposed to perform PFAM and NAG metabolism are described. RNAi knockdown studies revealed further information about the metabolism of PFAMs and calls into question the recently proposed involvement of cytochrome c. Isotopic labeling studies showed there are two pathways for PFAM formation. A novel enzyme is likely to be involved in formation of NAGs from acyl-CoA intermediates.

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Lineswala, Jayana P. "Total synthesis of lavendamycin amides". Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1036197.

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The synthesis of 7-N-acetyldemethyllavendamycin butyl amide (47), 7-Nacetyldemethyllavendamycin isopropyl amide (48), 7-N-acetyldemethyllavendamycin amide of piperidine (49), 7-N-acetyldemethyllavendamycin amide of pyrrolidine (50), 7N-acetyldemethyllavendamycin amide of morpholine (51), demethyllavendamycin butyl amide (52), demethyllavendamycin amide of pyrrolidine (53), and demethyllavendamycin amide of morpholine (54) are described. Pictet Spengler condesation of 7-acetamido-2formylquinoline-5,8-dione (28) with tryptophan butyl amide (66), tryptophan isopropyl amide (67), tryptophan amide of piperidine (68), tryptophan amide of pyrrolidine (69), and tryptophan amide of morpholine (70) in an anisole - pyridine solution directly afforded the five lavendamycin amides 47-51. Compounds 52, 53, and 54 were obtained by hydrolysis of 47, 50, and 51 with 70% H2SO4-H20 solution.Aldehyde 28 was prepared according to the following general procedure.Nitration of 8-hydroxy-2-methylquinoline (30) yielded 8-hydroxy-2-methyl-5,7 dinitroquinoline (31). Compound 31 was then hydrogenated and acylated with acetic anhydride to yield 5,7-diacetamido-2-methyl-8-acetoxyquinoline (33). Compound 33 was oxidized by potassium dichromate to give 7-acetamido-2-methylquinoline-5,8-dione (27). Treatment of 27 with selenium dioxide in refluxing 1,4-dioxane afforded compound 28.Compounds 66, 67, 68, 69, and 70 were synthesized from compounds 61,62, 63, 64, and 65. These compounds were deprotected with ammonium formate in the presence of 10% Palladium on charcoal in methanol under an argon balloon at atmospheric pressure.Compounds 61, 62, 63, 64, and 65 were obtained from 58 with butylamine, isopropylamine, piperidine, pyrrolidine, and morpholine respectively in the presence of triethylamine under an argon balloon at atmospheric pressure.Compound 58 was synthesized by the reaction of N-carbobenzyloxytryptophan, with N-hydroxy succinimide, in the presence of N-dicyclohexylcarbodimide in dried and distilled dioxane under an argon balloon at atmospheric pressure.The structures of the novel compounds 58, 47, 48, 49, 50, 51, 52, 53, and 54 were confirmed by 1H NMR, IR, EIMS, and HRMS.The structures of protected and deprotected amides 61, 62, 63, 64, 65, 66, 67, 68, 69, and 70 were also confirmed by 1 H NMR and IR spectroscopy.
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McCarthy, Sean Joseph. "Strained amides as potential antibacterials". Thesis, University of Sussex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296003.

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Più fonti

Libri sul tema "Amides"

Arthur, Greenberg, Breneman Curt M e Liebman Joel F, a cura di. The amide linkage: Structural significance in chemistry, biochemistry, and materials science. Hoboken, NJ: Wiley-Interscience, 2003.

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Westlund, Neil Edward. Atropisomerism in hindered tertiary amides. Manchester: University of Manchester, 1996.

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Relihan, Colette. 1-Hydroxy-1-aminoalkenes: Enols of amides. Dublin: University College Dublin, 1998.

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Hickey, Kenneth. A study of amides in aqueous and non-aqueous solution. Dublin: University College Dublin, 1995.

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Mazurkiewicz, Roman. Studium reakcji imidoilowania amidów. Gliwice: Politechnika Śląska, 1989.

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Lemmerer, Miran. Chemoselective Nucleophilic α-Amination of Amides. Wiesbaden: Springer Fachmedien Wiesbaden, 2020. http://dx.doi.org/10.1007/978-3-658-30020-3.

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Pirilä-Honkanen, Päivi. Physicochemical properties of 2-pyrrolidinone and n-methylbenzenesulfonamide in binary solution mixtures. Oulu [Finland]: Oulun Yliopisto, 1996.

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Hutchby, Marc. Novel Synthetic Chemistry of Ureas and Amides. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32051-4.

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Bukowska, Jolanta. Spektroskopia oscylacyjna roztworów amidowych. Warszawa: Wydawnictwa Uniwersytetu Warszawskiego, 1986.

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Kolev, Tsonko. Quantum chemical, spectroscopic and structural study of hydrochlorides, hydrogens squarates and ester amides of squaric acid of amina. New York: Nova Science Publishers, 2008.

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Capitoli di libri sul tema "Amides"

Paulus, Wilfried. "Amides". In Microbicides for the Protection of Materials, 241–64. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2118-7_10.

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Gooch, Jan W. "Amides". In Encyclopedic Dictionary of Polymers, 33. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_546.

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Paulus, Wilfried. "Amides". In Directory of Microbicides for the Protection of Materials, 608–18. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/1-4020-2818-0_33.

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Smith, Robert M., e Arthur E. Martell. "Amides". In Critical Stability Constants, 423–25. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4615-6764-6_23.

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Sonke, Theo, e Bernard Kaptein. "Hydrolysis of Amides". In Enzyme Catalysis in Organic Synthesis, 561–650. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527639861.ch15.

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Lappert, M. F. "From Organotin Amides". In Inorganic Reactions and Methods, 353–54. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145234.ch139.

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Lappert, M. F. "From Organolead Amides". In Inorganic Reactions and Methods, 396. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145234.ch160.

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Carmalt, Claire J., Neville A. Compton, R. John Errington, George A. Fisher, Ismunaryo Moenandar, Nicholas C. Norman e Kenton H. Whitmire. "Homoleptic Bismuth Amides". In Inorganic Syntheses, 98–101. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132623.ch15.

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Ouellette, Robert J., e J. David Rawn. "Amines and Amides". In Organic Chemistry, 763–800. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-812838-1.50024-4.

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Ouellette, Robert J., e J. David Rawn. "Amines and Amides". In Principles of Organic Chemistry, 315–42. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-12-802444-7.00012-4.

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Atti di convegni sul tema "Amides"

Talukdar, P. J., K. Bharti, S. Basu, M. Pal, R. R. Paul, P. Lahiri e B. Lahiri. "Classification of pre-cancerous human oral tissue using FTIR spectroscopy aided by machine learning". In CLEO: Applications and Technology, JTu2A.190. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.jtu2a.190.

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We presented FTIR spectroscopy to analyze vibrational assessments of oral precancerous tissue of various grades. Classification model based on spectra of protein sections (amide I and amide III band) yields 83.33% sensitivity and 84% accuracy.

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Pogrebnoi, Vsevolod, Serghei Pogrebnoi e Fliur Macaev. "The alkylation of the amides of dehydroabietic acid". In Scientific seminar with international participation "New frontiers in natural product chemistry". Institute of Chemistry, Republic of Moldova, 2023. http://dx.doi.org/10.19261/nfnpc.2023.ab08.

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In this abstract is being discussed the synthesis of new substituted amides of dehydroabietic acid with different bromides in system K2CO3/DMF. It is known fact that many compounds, such as famous isatine 1, have the amide group in its molecule. There is no point in talking about it, because everything is known regarding chemical properties. However, what if there are two amide groups in the molecule at once? Let us see… For our investigation, we used the model of well-known alkylation reaction [1]. As starting material, we used two types of bromide: aliphatic and aromatic – bromoacetone [2] and phenacyl bromide [3], respectively, which reacted with dioxalane 2 [4] in above described conditions [4].The first approach was started from slight excess of corresponding bromide (1.2-1.3 eq.) and the full conversion observed after 3 hours at 40-500C. According to NMR spectrum, the isolated white solids are monosubstituted products – 3 and 4, respectively [4]. Increasing the amount of bromide to 3-4 equivalents didn't change the situation – the TLC showed only monosubstituted compounds. And the last approach was in significantly increasing the amount of bromide (up to 10 equivalents) and heating the reaction mixture above 1000C for several days, resulting a significant drop in the yield of the desired products and the formation of by-products that could not be isolated and characterized. The formation of monosubstituted products can be explained by steric factors – the close location of methyl and carbonyl group to the reaction center at the nitrogen atom in dehydroabietic fragment.

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Moraes, Fernanda C., Elson S. Alvarenga e Kariny B. Amorim. "Synthesis of novel amides derived from lumisantonin". In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_201391315423.

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Anastopoulos, G., E. Lois, A. Serdari, S. Stournas, F. Zannikos e S. Kalligeros. "The Impact of Aliphatic Amines and Tertiary Amides on the Lubrication Properties of Ultra Low Sulfur Diesel Fuels". In CEC/SAE Spring Fuels & Lubricants Meeting & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-1916.

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Jones, Saul, e Daniel Credgington. "Exploring the photophysics of carbene metal amides (Conference Presentation)". In Organic Light Emitting Materials and Devices XXII, a cura di Franky So, Chihaya Adachi e Jang-Joo Kim. SPIE, 2018. http://dx.doi.org/10.1117/12.2322372.

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Poku, Rosemary Aniwaa, Augustine Nkembo, Olufisayo Salako, Felix Amissah, Hernan Flores-Rozas, Tryphon Mazu e Nazarius S. Lamango. "Abstract 5090: Targeting metastatic prostate cancer with polyisoprenylated cysteinyl amides". In Proceedings: AACR 106th Annual Meeting 2015; April 18-22, 2015; Philadelphia, PA. American Association for Cancer Research, 2015. http://dx.doi.org/10.1158/1538-7445.am2015-5090.

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Musiol, Robert, Jaroslaw Polanski, Jiri Dohnal, Violetta Kozik, Barbara Podeszwa, Jacek Finster, Dominik Tabak, Katarina Kralova e Josef Jampilek. "Preparation and Herbicidal Activities of Substituted Amides of Quinoline Derivatives". In The 11th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2007. http://dx.doi.org/10.3390/ecsoc-11-01308.

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Gouvêa, Venise A., José C. Campos, Juliano Bosenbecker, Anaí Duarte, Rogério A. Freitag, Claudio M. P. Pereira e Geonir M. Siqueira. "Synthesis of amides and thioesteres derivatives, precursors to heterocyclic thiazolidinones". In 14th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-14bmos-r0052-1.

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Cavalcante Silva, S., J. H. Batista, Moraes F., N. de A. Pereira e G. C. Clososki. "Directed Metalation of Aromatic Aldimines Using Li/Mg-TMP Amides". In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_2013926134127.

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Gladkova, Elizaveta, Arina Chepanova, Alexandra Zakharenko e Olga Luzina. "New sulfonates and amides derived from berberine as Tdp1 inhibitors". In 6th International Electronic Conference on Medicinal Chemistry. Basel, Switzerland: MDPI, 2020. http://dx.doi.org/10.3390/ecmc2020-07464.

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Rapporti di organizzazioni sul tema "Amides"

Jiang, Zhiping, Leonard V. Interrante, Daekeun Kwon, Fook S. Tham e Rudy Kullnig. Synthesis, Structure and Pyrolysis of Organoaluminum Amides Derived from the Reaction of Trialkylaluminum Compounds with Ethylenediamine in a 3:2 Ration. Fort Belvoir, VA: Defense Technical Information Center, agosto 1990. http://dx.doi.org/10.21236/ada225758.

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Castner, E. W. Temperature-dependence of the ultrafast intermolecular dynamics of Amides: Formamide, N-methylformamide, N,N-dimethylformamide, N- methylacetamide, and N-methylpropionamide from 290-370 K. Office of Scientific and Technical Information (OSTI), giugno 1996. http://dx.doi.org/10.2172/249036.

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Lin, Terri C. Poly(amido amine) Dendrimers in Supercapacitors. Office of Scientific and Technical Information (OSTI), agosto 2013. http://dx.doi.org/10.2172/1091321.

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Fernando, P. U. Ashvin Iresh, Gilbert Kosgei, Matthew Glasscott, Garrett George, Erik Alberts e Lee Moores. Boronic acid functionalized ferrocene derivatives towards fluoride sensing. Engineer Research and Development Center (U.S.), luglio 2022. http://dx.doi.org/10.21079/11681/44762.

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In this technical report (TR), a robust, readily synthesized molecule with a ferrocene core appended with one or two boronic acid moieties was designed, synthesized, and used toward F- (free fluoride) detection. Through Lewis acid-base interactions, the boronic acid derivatives are capable of binding with F- in an aqueous solution via ligand exchange reaction and is specific to fluoride ion. Fluoride binding to ferrocene causes significant changes in fluorescence or electrochemical responses that can be monitored with field-portable instrumentation at concentrations below the WHO recommended limit. The F- binding interaction was further monitored via proton nuclear magnetic resonance spectroscopy (1H-NMR). In addition, fluorescent spectroscopy of the boronic acid moiety and electrochemical monitoring of the ferrocene moiety will allow detection and estimation of F- concentration precisely in a solution matrix. The current work shows lower detection limit (LOD) of ~15 μM (285 μg/L) which is below the WHO standards. Preliminary computational calculations showed the boronic acid moieties attached to the ferrocene core interacted with the fluoride ion. Also, the ionization diagrams indicate the amides and the boronic acid groups can be ionized forming strong ionic interactions with fluoride ions in addition to hydrogen bonding interactions.

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Selig, W. Determination of equivalent weight of amines. Office of Scientific and Technical Information (OSTI), gennaio 1987. http://dx.doi.org/10.2172/6881693.

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Whitaker, Craig, Jay R. Heckert e Ian C. Uber. Synthesis of Amide Functionalized Carbon Nanotubes. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2007. http://dx.doi.org/10.21236/ada519137.

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Thomson, J. S., J. B. Green, T. B. McWilliams e S. K. T. Yu. GC/MS determination of amines following exhaustive trifluoroacetylation. Office of Scientific and Technical Information (OSTI), agosto 1993. http://dx.doi.org/10.2172/10180988.

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Hameka, Hendrik F., George R. Famini, James O. Jensen e E. I. Newhouse. Computations of Vibrational Infrared Frequencies of Selected Amines. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1990. http://dx.doi.org/10.21236/ada218840.

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Mossine, Valerie V. Multivalent Lactulose-amines as Inhibitors of Prostate Cancer Metastasis. Fort Belvoir, VA: Defense Technical Information Center, marzo 2002. http://dx.doi.org/10.21236/ada406249.

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Hameka, H. F., G. R. Famini, J. O. Jensen e J. L. Jensen. Theoretical Prediction of Vibrational Infrared Frequencies of Tertiary Amines. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1991. http://dx.doi.org/10.21236/ada232880.

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