Vinylogous Reaction Strategies in Organic Synthesis

Vinylogous reaction strategies exploit the principle of vinylogy, whereby the electronic influence of a functional group is relayed through a conjugated π‐system to effect bond formation at a remote site. This concept has been harnessed to extend classic nucleophilic and electrophilic transformations beyond the α‐position of carbonyl compounds, allowing γ, ε or even more distal centres to engage in bond‐forming events. Recent advances have merged vinylogous activation with organocatalysis, Lewis and Brønsted acid catalysis, metal–ligand cooperativity and cascade sequences to deliver products with high levels of site‐ and stereocontrol. Higher‐order enolates and dienolates have enabled complex cycloaddition and Michael‐type additions, while intramolecular designs have afforded chiral polycycles via kinetic resolution or cascade vinylogous pathways. These strategies have proved powerful in the asymmetric construction of natural‐product frameworks, enabling remote stereocentre installation in a single operation and expanding the toolbox for efficient fragment coupling in target‐oriented synthesis.

Research from Nature Portfolio

One foundational study demonstrated catalyst‐controlled diastereodivergent vinylogous Michael addition of β,γ‐unsaturated butenolides to α,β‐unsaturated ketones. Two non‐enantiomeric organocatalysts were shown to direct formation of either syn‐ or anti‐adducts with unified high enantioselectivity, establishing a blueprint for remote stereocentre control. In another example, chiral N,N′‐dioxide–metal complexes were employed in a tandem isomerization/α‐Michael addition of β,γ‐unsaturated 2‐acyl imidazoles, converting readily available substrates into 1,5‐dicarbonyl frameworks bearing vicinal tertiary stereocentres in up to >99 % ee. A distinct approach achieved intramolecular vinylogous kinetic resolution of linear allylic esters via synergistic magnesium catalysis, constructing rigid [6.6.5]‐tricyclic skeletons with high efficiency and enantioselectivity, and revealing mechanistic insights into the vinylogous Michael pathway.

Vinylogous Reaction Strategies in Organic Synthesis publication trend

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

Technical terms

Vinylogy: Transmission of electronic effects through conjugated π-bonds to enable reactivity at remote positions.

Enolate: A carbonyl‐derived nucleophile at the α-carbon, often generated by deprotonation or metal activation.

Pentaenolate: A higher‐order enolate intermediate extending across five conjugated double bonds.

Vinylogous Michael reaction: Michael‐type addition occurring at a distal (γ or further) carbon of a conjugated enone or enal.

Kinetic resolution: A process in which one enantiomer of a racemate reacts faster than the other, enabling separation by rate differences.

Dienolate: A conjugated nucleophilic species in which negative charge is delocalised over two double bonds.

References

1. Pentaenolate activation in the organocatalytic allylic alkylation of indene-2-carbaldehydes. Chemical Communications (2023).
2. New Developments of the Principle of Vinylogy as Applied to π‑Extended Enolate-Type Donor Systems. Chemical Reviews (2020).
3. Diastereodivergent organocatalytic asymmetric vinylogous Michael reactions. Nature Communications (2014).
4. Lewis acid-catalyzed asymmetric reactions of β,γ-unsaturated 2-acyl imidazoles. Nature Communications (2020).
5. Activation of allylic esters in an intramolecular vinylogous kinetic resolution reaction with synergistic magnesium catalysts. Nature Communications (2020).
6. 5‑Substituted-furan-2(3H)‑ones in [8 + 2]-Cycloaddition with 8,8-Dicyanoheptafulvene. The Journal of Organic Chemistry (2022).