Metal-Free Photochemical Olefin Isomerization of Unsaturated Ketones via 1,5-Hydrogen Atom Transfer.

Autor: Manikandan R; Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel., Phatake RS; Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel., Lemcoff NG; Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2022 May 19; Vol. 28 (29), pp. e202200634. Date of Electronic Publication: 2022 Apr 06.
DOI: 10.1002/chem.202200634
Abstrakt: The photochemical isomerization of α,β- to β,γ-unsaturated ketones through a 1,5-hydrogen atom transfer mechanism under mild conditions with high efficiency and selectivity is reported. The reaction is carried out in the absence of metal catalysts or other additives, and its stereoselectivity can be tuned by selecting appropriate solvent mixtures. The reaction's scope and tolerance towards functional groups, including light-sensitive halogens, free acids and alcohols, were studied, providing reliable access to a wide variety of β,γ-unsaturated ketones. This methodology details the deconjugation of a wide range of unsaturated ketones and, when combined with olefin metathesis, provides an efficient process for either dehomologation or one-carbon double-bond migration of terminal alkenes.
(© 2022 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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