Aminocatalytic Asymmetric Synthesis Strategies

Aminocatalytic asymmetric synthesis employs small chiral amine catalysts to induce enantioselectivity through transient covalent intermediates and non-covalent interactions. Core approaches include enamine activation of carbonyl compounds for nucleophilic addition, iminium-ion activation to lower the LUMO of α,β-unsaturated substrates, and extended dienamine or trienamine activation for remote functionalisation. These modes often run in concert within cascade or tandem processes, enabling rapid assembly of complex architectures under mild, metal-free conditions. Modern developments have broadened the scope to include dearomative cycloadditions of heteroaromatics, regiodivergent transformations through precise catalyst-substrate recognition, and bifunctional catalysts that combine covalent and hydrogen-bonding activation. Such strategies have delivered high enantio- and diastereocontrol in key bond-forming events, fostering sustainable routes to pharmaceuticals, agrochemicals and natural-product motifs. The field continues to evolve through catalyst design, mechanistic elucidation and integration with photochemical or electrochemical methods to expand reactivity and address global demands for greener synthesis.

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Aminocatalytic Asymmetric Synthesis Strategies publication trend

The graph below shows the total number of articles in aminocatalytic asymmetric synthesis strategies across all publications each year (not limited to Nature Index journals).

Technical terms

Aminocatalysis: Use of a small organic amine to activate substrates covalently or via hydrogen bonding, enabling enantioselective transformations.

Enamine catalysis: Activation of carbonyl compounds through reversible conversion into enamines, rendering α-carbon nucleophilic.

Iminium-ion catalysis: Activation of α,β-unsaturated carbonyls by reversible formation of iminium ions, lowering the LUMO and facilitating conjugate addition.

Dienamine catalysis: Extension of enamine activation to conjugated dienals, generating dienamines that allow remote C–C bond formation.

Bifunctional organocatalysis: Catalysts combining covalent activation (enamine or iminium) with non-covalent interactions (hydrogen bonding or ion pairing) to enhance selectivity.

Dearomative cycloaddition: Cycloaddition process that converts aromatic systems into saturated or partially saturated ring systems, sacrificing aromaticity for complexity.

References

1. Differentiating Catalysis in the Dearomative [4 + 2]-Cycloaddition Involving Enals and Heteroaromatic Aldehydes. Organic Letters (2022).
2. Direct, Asymmetric Synthesis of Carbocycle‐Fused Uracils via [4+2] Cycloadditions: a Noncovalent Organocatalysis Approach. Advanced Synthesis & Catalysis (2021).
3. Turning the Imidazole Core into Three‐Dimensional Ring Systems: Mild Organocatalytic Entry to Enantiopure 6,7‐Dihydrobenzimidazoles. Chemistry - A European Journal (2023).