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Showing 1 to 15 of 15 for “"alpha amino acids"”.
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Synthesis and reactivity of alpha-trialkylsilyl alpha-amino acids
… work deals with the synthesis and reactivity of alpha-trialkylsilyl alpha-amino acids. They were synthesised using an established protocol involving rhodium(II)-catalysed insertion reactions of alpha-trialkylsilyl alpha-diazo esters into N-H bonds of carbamates. As an extension to this procedure, …
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Synthesis of novel quaternary alpha-amino acids and 2-imidazolines derived from oxazol-5(4H)-ones and evaluation of their proteasoman inhibition activity
Thesis (Ph. D.)--Michigan State University. Dept. of Chemistry, 2010
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Asymmetrische Synthese von Gamma-Hydroxy-Alpha-Aminosäuren, 1,3-Aminoalkoholen und 2-Amino-3-Phosphonopropionsäure
… we optimised a procedure to synthesize 1,3-amino alcohols and applied it to a wide range of substituted substrates. Starting from aldehyde SAMP-hydrazones we obtained beta-hydroxy SAMP-hydrazones in a titanium-mediated aza-analogous aldol reaction. After protection, 1,2-addition and cleavage …
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The preparation of the coordination compounds of platinum (II) and arginine, histidine, lysine, and serine
… coordination compounds of platinum (II) and four alpha-amino acids, namely arginine, histidine, lysine, and serine. A first analysis of the problem would seem to indicate that the preparations should be straightforward and not difficult. Bailar (3) stresses the great coordination tendency of the …
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Stabilization of Valence Through Coordination: I. The Stabilities of Some Complexes of Alpha-Amino Acids With Divalent Metals. Ii. A Polarographic Study of the Complexes of Hydrazine With Zinc and Cadmium
Made available in DSpace on 2015-05-12T17:02:31Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0009125.PDF: 3603358 bytes, checksum: 9d7c06bea967aaf4cc9b0ca85456262f (MD5) Previous issue date: 1954
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Enantioselective synthesis of alkenyl aziridine carboxylates and 4-phenylsulfenyl prolines
Chiral cyclic and acyclic allyl aminosulfoxonium ylides have been generated from aminosulfoxonium-substituted gamma,delta-unsaturated alpha-amino acids (method A) and 1-alkenyl aminosulfoxonium salts (method B) upon treatment with DBU. Their application to the asymmetric aziridination of …
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Struktur, Hydroxyalkylierung und Aminoalkylierung von Titanaallylsulfoximinen: Enantioselektive Synthese ungesättigter Alpha-Aminosäuren
Structure, Hydroxyalkylation and Aminoalkylation of Titanaallylsulfoximines: Enantioselective Synthesis of Unsaturated alpha-Amino Acids Enantiopure E- and Z-allylic sulfoximines were lithiated and transmetallated with ClxTi(OR)4-x to give bis(2-alkenyl)titanium(IV)-complexes. These complexes …
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Photoredox activation of carbon dioxide and unactivated aliphatic carbonyl compounds
… 1: Photoredox Activation of Carbon Dioxide for Amino Acid Synthesis in Continuous Flow. Although carbon dioxide (CO₂ ) is highly abundant, its low reactivity has limited its use in chemical synthesis. In particular, methods for carbon-carbon bond formation generally rely on two-electron …
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1,3-Aminoalkohole als Bausteine in der asymmetrischen Synthese von Azetidinen, Azetidincarbonsäuren und Piperidin-3-olen
… azetidines and especially azetidine carboxylic acids in the literature.A versatile and efficient asymmetric synthesis of substituted azetidines with excellent diastereomeric and enantiomeric excesses (de = 93-99%, ee = 96-99%) in good overall yields starting from SAMP-hydrazones is described. …
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Asymmetrische Synthese von bicyclischen Alpha-Aminosäuren durch intramolekulare Pauson-Khand-Reaktion von l-Alkenylsulfoximinen und Festphasensynthese mit Allylsulfoximinen
… is an asymmetric synthesis of novel bicyclic alpha-amino acids having a hexahydro cyclopenta[c]pyridine skeleton, carrying an enone structural element, and a substituent in beta-position. Starting from enantiomerically pure (S)-N,S-Dimethyl-S-phenylsulfoximine allylic sulfoximines could easily …
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Beta-o-glicosilación de péptidos que incorporan aminoácidos no naturales
… analysis in aqueous solution of different alpha-methyl-alpha-amino acid diamides, derived from serine (Ser), threonine (Thr), beta-hydroxyciclobutane-alpha-amino acids and their corresponding model beta-O-glycopeptides, are reported. From this study, it can be concluded that the …
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Design and modification of rhodium and iridium N-heterocyclic carbene complexes for asymmetric transfer hydrogenation and antimicrobial activity
… first project details the design of iridium NHC amino acid complexes for asymmetric transfer hydrogenation (ATH) of prochiral ketones. Iridium(I) bis-NHC complexes were found to undergo oxidative addition with a variety of alpha-amino acids, generating chiral iridium(III) complexes of the form …
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Microfluidic systems for continuous crystallization of small organic molecules
… of the habit modification mechanism for alpha glycine in the presence of alpha amino acids. Such information may not only provide insights into impurity-crystal interactions, but also serve as a powerful tool for the design of impurities that can be deliberately added to improve the …
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Asymmetrische Synthese 3-substituierter 4-Methylenproline und Untersuchungen zur Metathese mit vinylischen Sulfoximinen
… was transformed in a titanium mediated aminoalkylation reaction with ethyl N-2-methylpropane-2-sulfonylimino acetate into the two diastereomeric amino acid esters. The two new stereocenters were formed with more than 98% d.e. Only the double bond is formed in a mixture of (E) and (Z). …