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30 results on '"Kärkäs, Markus D."'

1. Electrosynthetic C−O Bond Activation in Alcohols and Alcohol Derivatives

Author

Villo, Piret, Shatskiy, Andrey, Kärkäs, Markus D., Lundberg, Helena, Villo, Piret, Shatskiy, Andrey, Kärkäs, Markus D., and Lundberg, Helena

Abstract

Alcohols and their derivatives are ubiquitous and versatile motifs in organic synthesis. Deoxygenative transformations of these compounds are often challenging due to the thermodynamic penalty associated with the cleavage of the C−O bond. However, electrochemically driven redox events have been shown to facilitate the C−O bond cleavage in alcohols and their derivatives either through direct electron transfer or through the use of electron transfer mediators and electroactive catalysts. Herein, a comprehensive overview of preparative electrochemically mediated protocols for C−O bond activation and functionalization is detailed, including direct and indirect electrosynthetic methods, as well as photoelectrochemical strategies., QC 20230615

Published
2023
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4. Synthesis of Sulfonylated Heterocycles via Copper-Catalyzed Heteroaromatization/Sulfonyl Transfer of Propargylic Alcohols

Author

Chen, X., Shatskiy, Andrey, Liu, Jianquan, Kärkäs, Markus D., Wang, X. -S, Chen, X., Shatskiy, Andrey, Liu, Jianquan, Kärkäs, Markus D., and Wang, X. -S

Abstract

An unprecedented copper-catalyzed heteroaromatization/sulfonyl transfer of propargylic alcohols with isocyanide has been developed. 3-Sulfonyl benzofurans and indoles were produced under Cu(I) catalysis in good to high yields. The developed catalytic methodology provides controlled, modular, and facile access to sulfonyl benzoheterocycle scaffolds., QC 20210322

Published
2021
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5. Biomass Processing via Photochemical Means

Author

Shatskiy, Andrey, Kärkäs, Markus D., Shatskiy, Andrey, and Kärkäs, Markus D.

Abstract

Biomass has emerged as a promising renewable source for production of platform chemicals, fuels, and materials. Lignin, an irregular structure and water-insoluble polymer, is the largest renewable feedstock for aromatic building blocks and materials. Photoredox-based reaction strategies have emerged as a powerful platform for harnessing the unique reactivity of open-shell intermediates, such as radicals and radical ions. Various strategies for photochemical valorization of biomass have been presented. The proton-coupled electron transfer reactions have also found a variety of practical applications in synthetic chemistry, furnishing a number of indispensable reaction manifolds. This chapter focuses on molecularly defined catalytic systems for valorization of lignin activated by visible light. A series of photocatalysts with varying oxidative/reductive power was synthesized by copolymerization of carbazole-derived donor and acceptor monomers in different ratios via Fe-catalyzed oxidative polymerization. The photocatalytic reduction of the N-O bond in the acyl oximes was achieved with a phenothiazine-based photocatalyst., Part of ISBN 9783527825028 9783527347179QC 20230724

Published
2021
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6. Silver-Catalyzed [3+1+1] Annulation of Nitrones with Isocyanoacetates as an Approach to 1,4,5-Trisubstituted Imidazoles

Author

Lv, L., Chen, Y., Shatskiy, Andrey, Liu, Jian quan, Liu, X., Kärkäs, Markus D., Wang, X. -S, Lv, L., Chen, Y., Shatskiy, Andrey, Liu, Jian quan, Liu, X., Kärkäs, Markus D., and Wang, X. -S

Abstract

A silver-catalyzed protocol for [3+1+1] annulation of nitrones and isocyanoacetates is reported. The reaction is proposed to proceed through sequential [3+2] cycloaddition, ring-opening, cyclization-oxidation, and dealkylation, allowing access to a broad scope of valuable polysubstituted imidazoles in high yields.

Published
2020
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