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CC BY-ND-NC 4.0 · Synlett 2019; 30(07): 803-808
DOI: 10.1055/s-0037-1612079
DOI: 10.1055/s-0037-1612079
letter
Efficiency and Selectivity Aspects in the C–H Functionalization of Aliphatic Oxygen Heterocycles by Photocatalytic Hydrogen Atom Transfer
We thank the MIUR for financial support (SIR Project ‘Organic Synthesis via Visible Light Photocatalytic Hydrogen Transfer’; Code: RBSI145Y9R).Weitere Informationen
Publikationsverlauf
Received: 05. Dezember 2018
Accepted after revision: 01. Januar 2019
Publikationsdatum:
05. Februar 2019 (online)
Published as part of the Special Section 10th EuCheMS Organic Division Young Investigator Workshop
Abstract
The C–H to C–C conversion in aliphatic oxygen heterocycles (dioxolanes, 1,3-dioxane, or cyclic carbonates) by photocatalytic hydrogen atom transfer and subsequent trapping of the resulting radical with phenyl vinyl sulfone was investigated. The performance of three different photocatalysts, namely tetrabutylammonium decatungstate and the aromatic ketones thioxanthone and 9-fluorenone, was compared. The UV-light-absorbing decatungstate anion is more efficient and permits the use of a smaller excess of hydrogen donor than the aromatic ketones, although the ketones could be excited by visible light. Further intramolecular selectivity studies revealed that aromatic ketones afforded a higher proportion of functionalization at the acetalic versus the ethereal positions than did the decatungstate anion.
Key words
photocatalysis - hydrogen atom transfer - oxygen heterocycles - chemoselectivity - radicals - C–C bond formationSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0037-1612079.
- Supporting Information
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References and Notes
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