Organoboron Chemistry and Synthesis Techniques

Organoboron compounds occupy a central role in modern synthetic chemistry, serving as versatile intermediates for the construction of complex molecular architectures. The unique reactivity of boron–carbon bonds underpinned the development of powerful cross-coupling protocols, notably Suzuki–Miyaura coupling, which enables the formation of carbon–carbon bonds under mild conditions and with high functional-group tolerance. Beyond palladium-catalysed couplings, recent innovations have harnessed photoredox catalysis and radical pathways to effect novel bond disconnections, including radical 1,2-boron shifts and decarboxylative cross-couplings. The emergence of strain-enabled rearrangements of boronate complexes has opened new avenues for asymmetric difunctionalisation of σ-bonds, providing access to enantioenriched scaffolds. Concurrently, multicomponent and mechanochemical strategies have begun to replace conventional solvent-intensive processes, offering sustainable, catalyst-free approaches to bifunctional α-halo and α-chloro boronic esters. These developments underscore the global significance of organoboron chemistry for pharmaceutical synthesis, agrochemical design and materials science, where controllable reactivity, stereochemical fidelity and environmental considerations converge.

Research from Nature Portfolio

Recent studies have demonstrated a visible-light-induced photoredox decarboxylative radical cross-coupling that initiates a radical 1,2-boron shift. Under neutral conditions and with broad functional-group tolerance, β-boryl NHPI esters undergo photoredox activation to generate translocated carbon radicals, which can be trapped by diverse radical acceptors. This mild protocol accommodates a wide scope of substrates, including complex bioactive motifs, and offers an alternative route to primary organoborons via novel radical migrations.

Organoboron Chemistry and Synthesis Techniques publication trend

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

Technical terms

Photoredox catalysis: A technique that uses light to promote electron transfer via photoexcited catalysts, enabling radical generation under mild conditions.

Radical 1,2-boron shift: A process in which a boron substituent migrates one position along a carbon chain through a radical intermediate.

1,2-Metalate rearrangement: A reaction in which an organometallic boronate complex undergoes intramolecular migration of a substituent across adjacent bonds.

Boronate complex: An adduct formed between a boronic ester (or borane) and a nucleophile, often serving as a reactive intermediate in rearrangements.

Mechanochemistry: Activation of chemical reactions by mechanical force, such as ball milling, typically offering solvent-free and energy-efficient pathways.

References

1. Decarboxylation of β-boryl NHPI esters enables radical 1,2-boron shift for the assembly of versatile organoborons. Nature Communications (2023).
2. Iridium-Catalyzed Asymmetric Difunctionalization of C–C σ‑Bonds Enabled by Ring-Strained Boronate Complexes. Journal of the American Chemical Society (2023).
3. Multicomponent synthesis of α-chloro alkylboronic esters via visible-light-mediated dual catalysis. Chem (2023).
4. Mechanochemical Synthesis of α‐halo Alkylboronic Esters. Advanced Science (2024).