Boron-Based Organic Synthesis Techniques

Boron has emerged as a versatile element in modern organic synthesis, enabling the construction of complex molecules with precision and efficiency. Key strategies include catalytic borylation of unsaturated substrates, hydroboration of alkenes and alkynes, and utilisation of boron‐containing auxiliaries such as pinacol boronate (Bpin) and N‐methyliminodiacetic acid (MIDA) boronates. Transition-metal catalysts—particularly copper and rhodium complexes—facilitate regioselective and stereocontrolled C–B bond formation under mild conditions. Multicomponent reactions incorporating boron reagents streamline diversity‐oriented synthesis, while asymmetric methodologies deliver enantioenriched boronic esters that serve as precursors to quaternary stereocentres. Advances in heterogeneous and aqueous‐phase catalysis have enhanced sustainability, and developments in boron-mediated cyclisation and C–H functionalisation expand the toolkit for medicinal, agrochemical and materials applications. Collectively, these techniques underpin the rapid assembly of bioactive frameworks, tailor physico-chemical properties and accelerate the discovery of functional probes and therapeutics.

Research from Nature Portfolio

Recent studies have harnessed the β-boronyl group as a modular handle for divergent stereocontrol. One approach employs a small boronyl substituent to direct syn or anti α-functionalisation of enolates, affording contiguous stereodiads in high yield and diastereoselectivity and enabling access to key intermediates for natural product and drug synthesis. Another strategy demonstrates rhodium-catalysed asymmetric reversed hydroboration of β,β-disubstituted α,β-unsaturated amides, delivering tertiary boronic esters with excellent enantioselectivity and unprecedented chemo-control of inert Michael acceptors. Foundational work has also mapped multicomponent routes to α- and β-aminocyano(MIDA)boronates, furnishing selective and cell-active inhibitors of lipid-metabolising enzymes. Together, these advances showcase the power of boron-based reagents to construct stereochemically rich architectures and to generate finely tuned chemical probes.

Boron-Based Organic Synthesis Techniques publication trend

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

Technical terms

Borylation: Introduction of a boron substituent into an organic molecule, typically by catalytic addition of a boron reagent to unsaturated bonds.

Hydroboration: Addition of a boron–hydrogen bond across an alkene or alkyne to form an organoboron intermediate.

Enantioselectivity: Preference for the formation of one enantiomer over its mirror image in a chemical reaction.

MIDA boronate: A boronic ester protected by N-methyliminodiacetic acid, used as a stable, isolable boron synthon.

Stereodiad: A pair of adjacent stereocentres whose relative configuration is controlled during synthesis.

References

1. A unified approach for divergent synthesis of contiguous stereodiads employing a small boronyl group. Nature Communications (2020).
2. Enantioselective synthesis of tertiary boronic esters through catalytic asymmetric reversed hydroboration. Nature Communications (2021).
3. Multicomponent mapping of boron chemotypes furnishes selective enzyme inhibitors. Nature Communications (2017).
4. Development of a New Methodology for Dearomative Borylation of Coumarins and Chromenes and Its Applications to Synthesize Boron-Containing Retinoids. Molecules (2023).
5. anti -Selective synthesis of β-boryl-α-amino acid derivatives by Cu-catalysed borylamination of α,β-unsaturated esters. Chemical Science (2022).
6. Boronic Acids and Their Derivatives in Medicinal Chemistry: Synthesis and Biological Applications. Molecules (2020).