Vicinal amino alcohols are important structural motifs of bioactive compounds. Reported herein is an efficient method for their synthesis based on the palladium-catalyzed oxy-alkynylation, oxy-arylation, or oxy-vinylation of allylic amines. High regio- and stereoselectivity were ensured through the in situ formation of a hemiaminal tether using the cheap commercially available trifluoroacetaldehyde in its hemiacetal form. The obtained compounds are important building blocks, which can be orthogonally deprotected to give either free alcohols, amines, or terminal alkynes.
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http://dx.doi.org/10.1002/anie.201500636 | DOI Listing |
Molecules
November 2024
Departamento de Química Orgánica e Inorgánica, Facultad de Ciencias, and Instituto del Agua, Cambio Climático y Sostenibilidad (IACYS)-Unidad de Química Verde y Desarrollo Sostenible, Universidad de Extremadura, 06006 Badajoz, Spain.
This publication reports a facile and convenient preparation of tri--acetyl-glucopyranoses, derived from the corresponding 2-deoxyaminosugar, where the vicinal anomeric and C2 positions are decorated by azido and (thio)ureido groups, respectively. This double functionalization leads to an inherently chiral core incorporating the versatile azido and (thio)ureido linkages prone to further manipulation. The latter also provides a structural element for hydrogen-bonded donor-acceptor (HB-DA) sites, which are of immense value in organocatalytic pursuits.
View Article and Find Full Text PDFNat Commun
November 2024
College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.
Enantioenriched unsymmetrical vicinal diamines are important basic structural motifs. While catalytic asymmetric intermolecular 1,2-diamination of carbon-carbon double bonds represents the most straightforward approach for preparing enantioenriched vicinal-diamine-containing heterocycles, these reactions are often limited to the installation of undifferentiated amino functionalities through metal catalysis and/or the use of stoichiometric amounts of oxidants. Here, we report organocatalytic enantioselective unsymmetrical 1,2-diaminations based on the rational design of a bifunctional 1,2-diamination reagent, namely, azocarboxamides (ACAs).
View Article and Find Full Text PDFOrg Lett
November 2024
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin 130012, China.
Here, we describe an enantioselective intramolecular oxidative aminoacetoxylation reaction using a palladium catalyst and an aryl-substituted internal alkene compound as the substrate under mild conditions in several hours. The triazole-oxazoline ligand was selected for the asymmetric catalyst. A range of enantioenriched pyrrolidine-derived vicinal amino acetate compounds were synthesized, showing yields from 47% to 84%, diastereomer ratios from 57:43 to 95:5, and enantiomer excesses from 67% to 92%.
View Article and Find Full Text PDFACS Omega
October 2024
Theory Department, Laboratory for Computational Biochemistry and Drug Design, National Institute of Chemistry, Hajdrihova 19, Ljubljana SI-1000, Slovenia.
The complete two-step hydride transfer mechanism of amine oxidation involved in the metabolism of monoamine neurotransmitters was scrutinized by DFT calculations. In living organisms, this process is catalyzed by monoamine oxidase enzymes. Herein, we focus on some intriguing aspects of the reaction that may have been previously noticed but have not been clarified to date.
View Article and Find Full Text PDFJ Sci Food Agric
October 2024
Department of Biotechnology, Faculty of Technology Novi Sad, University of Novi Sad, Novi Sad, Serbia.
Background: To remain competitive, brewers must innovate by incorporating novel elements beyond traditional styles. Thus, exploring triticale as a modern substitute for barley malt is promising, especially given its higher amylolytic activity compared to barley. This study aimed to assess the impact of substituting up to 50% of barley malt with unmalted triticale on green beer quality, encompassing multiple stages from wort production to primary fermentation at a laboratory scale.
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