Oxidative Coupling Techniques in Organic Synthesis

Oxidative coupling encompasses strategies that unite two molecular fragments via the formation of new C–C or C–heteroatom bonds under oxidative conditions. These methods range from cross-dehydrogenative coupling—where two C–H bonds are directly transformed—through directed C–H functionalisation mediated by transition-metal catalysts, to entirely metal-free and enzyme-assisted approaches. By employing benign oxidising agents such as molecular oxygen or hydrogen peroxide, and by designing tailored ligands or organocatalysts, researchers have achieved high selectivity, including enantioselective biaryl formation and spirocycle synthesis. Mechanistic advances have clarified the roles of radical and metal-bound intermediates, enabling control of site-selectivity and stereochemistry. Collectively, these developments offer atom-economical, sustainable routes to complex scaffolds widely used in pharmaceuticals, agrochemicals and advanced materials.

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Oxidative Coupling Techniques in Organic Synthesis publication trend

The graph below shows the total number of articles in oxidative coupling techniques in organic synthesis across all publications each year (not limited to Nature Index journals).

Technical terms

Oxidative coupling: A transformation in which two fragments form a new bond via an oxidative process, often using a catalyst and oxidising agent.

Cross-dehydrogenative coupling: Direct union of two C–H or C–H and X–H bonds without prefunctionalisation, employing an oxidant to remove hydrogen.

C–H functionalisation: Activation of a carbon–hydrogen bond to create a new C–X bond, maximising atom economy.

Radical intermediate: A transient species bearing an unpaired electron that participates in bond formation through radical pathways.

Enantioselectivity: The preferential formation of one enantiomer over its mirror image, measured by enantiomeric excess.

References

1. Nitrosonium ion catalysis: aerobic, metal-free cross-dehydrogenative carbon–heteroatom bond formation. Chemical Communications (2018).
2. A bio-inspired synthesis of oxindoles by catalytic aerobic dual C–H functionalization of phenols. Chemical Science (2016).
3. Mechanistic Insights into the FeCl3‑Catalyzed Oxidative Cross-Coupling of Phenols with 2‑Aminonaphthalenes. The Journal of Organic Chemistry (2020).