Asymmetric Carboalumination and Metal-Catalyzed Synthesis Techniques

Asymmetric carboalumination represents a powerful strategy for the enantioselective construction of carbon–carbon bonds, employing aluminium reagents in concert with transition-metal catalysts to append alkyl fragments across unsaturated substrates. Central to this approach is the control of both regio- and stereochemistry, achieved through judicious catalyst design and ligand selection. Zirconium-based systems pioneered this field by enabling the Zr-catalysed asymmetric carboalumination of simple alkenes, delivering high enantiomeric excesses under mild conditions. Beyond aluminium, a broad array of metal-catalysed carbometallation and cyclisation techniques has emerged, encompassing titanium- and niobium-promoted additions, as well as ring-closing metathesis driven by ruthenium carbenes. Collectively, these methods have advanced the synthesis of complex frameworks—from heterocycles to densely functionalised olefins—and underpin contemporary routes to bioactive molecules and advanced materials.

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Asymmetric Carboalumination and Metal-Catalyzed Synthesis Techniques publication trend

The graph below shows the total number of articles in asymmetric carboalumination and metal-catalyzed synthesis techniques across all publications each year (not limited to Nature Index journals).

Technical terms

Asymmetric carboalumination: A reaction in which an aluminium reagent and an organic fragment are added across an unsaturated bond under chiral metal catalysis, affording enantioenriched products.

Enantioselectivity: The preferential formation of one enantiomer over its mirror image in a chiral reaction, often quantified by enantiomeric excess.

Carbometallation: The addition of a carbon–metal bond (from an organometallic reagent) across an unsaturated substrate, forming a new carbon–carbon bond and a metal-substituted intermediate.

Regioselectivity: The tendency of a chemical reaction to produce one structural isomer preferentially over others when multiple pathways are possible.

Chiral ligand: A molecule bound to a metal centre that imparts asymmetry, guiding the spatial arrangement of reacting substrates and determining enantiomeric outcome.

References

1. Carbozincation of Substituted 2-Alkynylamines, 1-Alkynylphosphines, 1-Alkynylphosphine Sulfides with Et2Zn in the Presence of Catalytic System of Ti(O-iPr)4 and EtMgBr. Catalysts (2019).
2. Discovery of ZACA reaction − Zr-catalyzed asymmetric carboalumination of alkenes. Arkivoc (2010).
3. NbCl5-Mg Reagent System in Regio- and Stereoselective Synthesis of (2Z)-Alkenylamines and (3Z)-Alkenylols from Substituted 2-Alkynylamines and 3-Alkynylols. Molecules (2021).