Remote Fluorination of α,β-Unsaturated Carbonyls via Silyl Dienol Ethers

24 January 2024, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

We report a general, regioselective, and metal free γ-fluorination of α,β-unsaturated carbonyls via silyl dienol ethers that are readily prepared from simple ketones and aldehydes. The transformation displays broad scope including 27 cyclic and acyclic siloxydienes providing γ-fluoro compounds in 28–91% yield. Notably, the reported conditions are also suitable for the synthesis of challenging tertiary fluorides. The regioselectivity of the reaction was studied on a series of acyclic siloxydienes and was observed to be sensitive to the conformational flexibility of the substrate. Diversification of the γ-fluorocarbonyls demonstrates the promise of fluorine as a stereocontrol element.

Keywords

fluorine
siloxydienes
regioselectivity
stereoselectivity

Supplementary materials

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Description
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Supporting Information
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Experimental procedures, characterization data
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NMR Spectra
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NMR spectra for new compounds
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