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DOI: 10.1055/a-2017-4685
A Mild Method for the Replacement of a Hydroxyl Group by Halogen: 4. Practical Synthesis of Cyclic β-Halovinylketones under Neutral Conditions
We are grateful to the Administration Générale de la Coopération au Développement (AGCD) for providing a Ph.D. fellowship to F.M. We also thank the Belgian Federal Science Policy Office, Belgian Federal Government (SPPS, action concertée 86-91-84), Ciba-Geigy (Basel) and UCLouvain for support.
With admiration and friendship to Prof. Alain Krief on the occasion of his 80th birthday.
Abstract
The replacement of a hydroxyl group by a halogen is a pivotal organic functional group transformation. Existing procedures often require acidic conditions or lack sustainability and atom economy. We have previously shown that tetramethyl-α-haloenamines (TMXE) or 2,2-dimethyl-1-halo-1-diisopropylamines (DIXE) react with a wide variety of hydroxyl-containing molecules to yield the corresponding halides under very mild conditions and with high atom economy. We now show that the deoxyhalogenation reactions of the enol tautomers of cyclic1,3-diketones and of 2-hydroxymethylene cycloketones can also be performed with TMCE or DIXE to yield β-halo-α,β-unsaturated ketones in excellent yields. The reactions are regioselective and in some cases stereoselective. The reaction is also successful with acetylacetone but the yield is only moderate. β-Ketoesters are not reactive. The method favorably compares to the best existing methods: It is more general, occurs under very mild conditions, which should allow acid-sensitive functional groups such as ketals, esters, ethers, etc., to be tolerated, and, above all, is quite sustainable (no toxic reagents or products).
Key words
deoxyhalogenation - α-chloroenamines - α-bromoenamines - α-iodoenamines - cyclohexane-1,3-diones - cyclopentane-1,3-diones - β-halovinyl ketonesPublikationsverlauf
Eingereicht: 21. November 2022
Angenommen nach Revision: 22. Januar 2023
Accepted Manuscript online:
22. Januar 2023
Artikel online veröffentlicht:
02. März 2023
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