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Showing 1 to 13 of 13 for “"Brønsted acid catalysis"”.
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Electrostatically Enhanced Phosphoric Acids and Their Applications in Brønsted Acid Catalysis
Different types of Brønsted acid catalysts are commonly used in a wide variety of organic transformations and are of continuing interest because there is a general need to carry out reactions in a faster and higher yielding manner with greater selectivities. Phosphoric acid derivatives, with their …
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Brønsted Acid Catalyzed Carbon-Carbon Bond Forming Reactions
… development of new methodology in the field of Brønsted acid catalysis enabling rapid synthesis of medicinally relevant compounds. It is foreseen that small molecule sulfonic acids evaluated in this research project will unveil new asymmetric carbon carbon bond forming reactions between …
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Brønsted acid-catalyzed reaction of alkynyltrifluoroborates with acetals and ketals
… great importance in synthetic organic chemistry. Brønsted acid catalysis is a powerful synthetic tool to make many different compounds, however, the current carbon-based nucleophiles are the major limitation of acid-catalyzed reactions. In effort to expand repertoire of Brønsted acid compatible …
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Applications of 2,3-Diketoesters in Organic Synthesis and Stereoselective Transformations
… yield to form dihydrofuranols that undergo acid catalyzed dehydration under mild conditions to generate 3-methoxyfuran-2-carboxylates in good yield. Oxidation of ζ-keto-α-diazo-β-ketoesters that are formed by zinc triflate catalyzed Mukaiyama-Michael condensation of methyl diazoacetoacetate …
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Development of Catalytic Enantioselective Minisci-type Reactions
… through the dual techniques of chiral Brønsted acid catalysis and photocatalysis. The first research section details the initial hypothesis, design and implementation of our strategy for the enantioselective -C–H heteroarylation of alcohols by regio- and enantioselective Minisci …
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Studies towards controlling selectivity in Minisci reactions
… particularly due to developments in photoredox catalysis, have allowed for milder reaction conditions and a multitude of radical precursors. However, controlling regioselectivity in Minisci reactions remains challenging, when there are multiple accessible positions on the heteroarene. …
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Harnessing cheminformatics for catalyst design I. Investigation into a general, asymmetric synthesis of cinchona alkaloid analogs towards asymmetric phase transfer II. Development of an enantioselective brønsted acid catalyzed four-component Ugi reaction
… reaction. Second, (R)-BINOL derived phosphoric acids were studied in regards to the brønsted acid catalyzed Ugi reaction. In regards to Cinchona alkaloids, the concentration was first on methodology develop to rapidly synthesize diverse Cinchona-like analogs in a highly enantioenriched fashion. …
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Catalytic C-H oxidation reactions for the synthesis and diversification of hydroxyamino acid motifs
Hydroxyamino acid motifs are well-represented structures in natural products and pharmaceuticals, and are widely employed as synthetic building blocks in organic synthesis. In nature, such compounds are often synthesized via enzymatic C-H oxidation of simple amino acid precursors. Inspired by such …
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Switchable butadiene sulfone pretreatment of lignocellulosic biomass
… dioxide, allowed for the formation of sulfurous acid in the presence of water. The sulfurous acid hydrolyzed xylan (hemicellulose), removing up to 91% of xylan into the liquid phase as a potential source of value-added products. In the pretreated solids, 90-99% of glucan was preserved, the key …
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Thermochemical Interconnectivities of Active Sites on Metal Oxides and their Catalytic Consequences in C−O Formation and C−H Scission Chemistry
… coordinated protons on lattice O-atoms act as Brønsted acid sites (H+), the coordinatively unsaturated cationic metal centers function as Lewis acid sites (Mδ+−Oδ−), and the anionic lattice O-atoms serve as redox sites (O*). These active sites coexist and collectively catalyze both parallel and …
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Synthesis of universal training sets and applications of chemoinformatics toward enantioselective reaction optimization
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Brønsted acid-catalyzed stereoselective allylation of exo-glycals with allyltrimethylsilane
… of exo-glycals using allyltrimethylsilane. This Brønsted acid-catalyzed transformation for the preparation of C,C-glycosides occurs readily in the presence of a tetrafluoroboric acid diethyl ether complex. In contrast to previously reported procedures, this reaction proceeds in a …
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Brønsted Acid-Catalyzed Reactions of Vinylboronic Acids and Benzhydryl Alcohols
… on harsh reaction conditions or the use of Lewis acid catalysts, which leads to low functional group tolerance. Herein, a methodology for the formation of 1,3,3-triphenylpropene derivatives through a Brønsted acid-catalyzed reaction of styrylboronic acids and benzhydryl alcohols is reported. The …