Electroinduced Reductive and Dearomative Alkene-Aldehyde Coupling

Area of Science:

• Organic Chemistry
• Electrochemistry
• Synthetic Methodology

Background:

• Direct coupling of alkenes and aldehydes is challenging due to limitations in substrate tolerance and functional group compatibility.
• Existing methods for C-C π-bond coupling with aldehydes are often restricted in complex molecular settings.

Purpose of the Study:

• To develop an efficient and versatile method for the direct coupling of simple alkenes, heteroarenes, and unactivated aliphatic aldehydes.
• To enable the synthesis of diverse C(sp3)-hybridized alcohols from readily available feedstocks.

Main Methods:

• Utilized electrochemically induced reductive activation of C-C π-bonds via rapid alternating polarity (rAP) electrolysis.
• Employed catalyst-free conditions for the reductive coupling process.
• Investigated the generation and reactivity of radical anion intermediates.

Main Results:

• Achieved direct coupling of alkenes and heteroarenes with aliphatic aldehydes, yielding diverse C(sp3)-hybridized alcohols.
• Demonstrated chemoselective generation of olefinic radical anion intermediates using rAP electrolysis.
• Reported unprecedented reductive dearomative functionalization for heterocyclic compounds.

Conclusions:

• The developed rAP electrolysis protocol provides a versatile and efficient route to C(sp3)-rich oxygenated scaffolds.
• This catalyst-free method expands the scope of reductive coupling reactions for organic synthesis.
• Offers straightforward access to structurally diverse alcohol products from simple feedstocks.