Diazo Compound Applications in C–H Bond Functionalization

Diazo compounds, bearing the general motif R2C=N2, have emerged as indispensable reagents for direct C–H bond functionalization, offering a gateway to complex molecular architectures with exceptional efficiency. Through the controlled extrusion of molecular nitrogen, these species generate electrophilic carbenes that engage in selective insertion into proximal C–H bonds or partake in cascade cyclisation sequences. Transition-metal catalysts—particularly rhodium, copper and iron complexes—facilitate these transformations under mild conditions, achieving high levels of chemo-, regio- and stereocontrol. Recent advances in ligand design, photochemical activation and transient directing-group strategies have extended the substrate scope from simple hydrocarbons to elaborate natural products and pharmaceutical intermediates. Metal-free protocols and enantioselective variants further broaden the toolkit, enabling late-stage modification of bioactive scaffolds and the rapid assembly of heterocyclic and carbocyclic frameworks. Collectively, these developments underscore the global impact of diazo-enabled C–H functionalization in streamlining synthetic routes, enhancing sustainability and accelerating the discovery of new materials and therapeutics.

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Diazo Compound Applications in C–H Bond Functionalization publication trend

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Technical terms

Diazo compound: Organic reagent featuring a diazo group (–N₂) that releases nitrogen to form reactive carbenes.

Carbene: Neutral divalent carbon species with two nonbonded electrons, capable of inserting into C–H bonds.

C–H activation: Process by which a carbon–hydrogen bond is cleaved and converted into a new carbon–X bond, increasing molecular complexity.

Carbenoid insertion: Formal insertion of a metal-stabilised carbene into a C–H bond to establish a new C–C linkage.

Directing group: Functional moiety that coordinates to a metal centre to guide site-selective C–H functionalization.

References

1. Rhodium-catalyzed transformations of diazo compounds via a carbene-based strategy: recent advances. RSC Advances (2024).
2. Rh( iii )-catalyzed regioselective intermolecular N -methylene Csp 3 –H bond carbenoid insertion. Chemical Science (2018).
3. Substrate-Controlled Divergent Synthesis of Benzimidazole-Fused Quinolines and Spirocyclic Benzimidazole-Fused Isoindoles. The Journal of Organic Chemistry (2024).