Issue 14, 2023

Sequence-selective three-component reactions of alkyltrifluoroborates with α,β-unsaturated carbonyl compounds and vinylphosphonium salts

Abstract

A photocatalytic three-component reaction of alkyltrifluoroborates with two different electron-deficient alkenes has been developed. The addition reaction occurs sequentially with α,β-unsaturated carbonyl compounds and vinyltriphenylphosphonium bromide in this order to produce α-branched γ-phosphoniocarbonyl compounds. The reaction could be followed by stereoselective Wittig olefination with various aldehydes to afford structurally diverse α-branched γ,δ-unsaturated ketones and esters with a Z-configuration. Mechanistic investigations suggested that boron trifluoride generated from the organotrifluoroborate activates the α,β-unsaturated carbonyl compound to facilitate the first chemoselective radical addition. We assume that the high efficiency of the second addition with the vinylphosphonium salt might arise from electrostatic interactions caused by the positive charge of the phosphonio group.

Graphical abstract: Sequence-selective three-component reactions of alkyltrifluoroborates with α,β-unsaturated carbonyl compounds and vinylphosphonium salts

Supplementary files

Article information

Article type
Research Article
Submitted
27 4 2023
Accepted
13 6 2023
First published
15 6 2023

Org. Chem. Front., 2023,10, 3654-3661

Sequence-selective three-component reactions of alkyltrifluoroborates with α,β-unsaturated carbonyl compounds and vinylphosphonium salts

M. Yoshida, M. Sawamura and Y. Masuda, Org. Chem. Front., 2023, 10, 3654 DOI: 10.1039/D3QO00631J

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