Organocatalytic Asymmetric Synthesis of Chromene Derivatives

Chromene derivatives, featuring a benzopyran ring system, are prevalent in a wide array of natural products and pharmaceuticals owing to their diverse biological activities, including antioxidant, anti‐inflammatory and antitumour effects. Organocatalytic asymmetric synthesis has emerged as a versatile and environmentally benign approach to access these chiral scaffolds under mild conditions, using small organic molecules as catalysts rather than metals. Central to this strategy are enantioselective cascade sequences—often tandem Michael additions followed by cyclisations—that forge multiple bonds and stereocenters in one‐pot processes with high stereocontrol. Advances in catalyst design, notably bifunctional systems incorporating hydrogen‐bond donors and Brønsted base sites, have significantly enhanced both enantioselectivity and reaction scope. Strategic substrate engineering—such as incorporation of nitrostyrene or enolate equivalents—and fine tuning of reaction parameters have enabled access to 2-substituted and 2,3-disubstituted chromene frameworks with excellent yields and enantiomeric excesses. Furthermore, mechanistic insights into catalyst–substrate interactions have guided the development of more robust and broadly applicable protocols. These methods not only streamline the synthesis of complex chromenes but also facilitate late‐stage functionalisation, underscoring their potential for rapid lead‐generation in medicinal chemistry.

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Organocatalytic Asymmetric Synthesis of Chromene Derivatives publication trend

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Technical terms

Organocatalysis: Catalysis using small organic molecules to accelerate chemical reactions.

Asymmetric synthesis: Construction of chiral molecules in which one enantiomer is formed preferentially.

Chromene: A benzopyran scaffold featuring a fused benzene and pyran ring.

Michael addition: Nucleophilic conjugate addition to an α,β-unsaturated carbonyl compound.

Enantioselectivity: Preference for formation of one enantiomer over the other in a chiral reaction.

References

1. Organocatalytic tandem Michael addition reactions: A powerful access to the enantioselective synthesis of functionalized chromenes, thiochromenes and 1,2-dihydroquinolines. Beilstein Journal of Organic Chemistry (2012).
2. Unusual Reactivities of ortho-Hydroxy-β-nitrostyrene. Molecules (2022).
3. Enantioselective Michael/Hemiketalization Cascade Reactions between Hydroxymaleimides and 2-Hydroxynitrostyrenes for the Construction of Chiral Chroman-Fused Pyrrolidinediones. Molecules (2022).