Stereodivergent Catalysis in Organic Synthesis

Stereodivergent catalysis encompasses strategies that allow chemists to access multiple stereoisomers of a target molecule selectively from the same starting materials by tuning catalytic components or conditions. This approach contrasts with conventional asymmetric synthesis, which typically furnishes a single stereoisomer. By exploiting distinct catalyst–substrate interactions—often through minimal ligand modification, dual-catalyst systems or bimetallic cooperativity—researchers can invert diastereochemical preference or independently control enantiomeric and diastereomeric outcomes. The ability to deliver all stereoisomers of complex scaffolds in high yield and stereopurity has profound implications for rapid structure–activity profiling in drug discovery, fine-chemical manufacture and natural product synthesis. Developments in stereodivergent design bridge fundamental mechanistic insight with scalable applications, offering striking improvements in efficiency and sustainable practices.

Research from Nature Portfolio

In one advance, a chiral copper–allenylidene system coupled with N-heterocyclic carbene catalysis realised the stereodivergent propargylic alkylation of α,β-unsaturated aldehydes. By selecting alternative combinations of copper and carbene frameworks, all four possible stereoisomers of propargylic adducts were obtained in uniformly high enantiomeric and diastereomeric ratios. The products serve as versatile intermediates for the synthesis of alkaloid frameworks.

Another study introduced a hybrid ruthenium–palladium catalyst pairing to promote dehydrative allylation of β-keto esters. Adjustment of the stereochemistry at each metal centre enabled on-demand generation of four diastereomers and, following chemoselective reduction, access to eight stereoisomers bearing three adjacent stereogenic centres. The protocol features mild, nearly neutral conditions that preclude epimerisation and has been applied to a formal synthesis of a bioactive natural product.

A foundational report described a synergistic copper–iridium cascade for stereodivergent assembly of tetrahydro-γ-carbolines. Through relay allylation followed by an iso-Pictet–Spengler cyclisation, this one-pot approach afforded up to four distinct stereoisomeric products under catalyst control. Mechanistic elucidation revealed that independent chiral environments in the two catalytic cycles are key to tuning diastereoselectivity and enantioselectivity concurrently.

Stereodivergent Catalysis in Organic Synthesis publication trend

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

Technical terms

Stereodivergent catalysis: A catalytic strategy that affords multiple stereoisomers of a product selectively via changes in catalyst or conditions.

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

Diastereoselectivity: Preference for formation of one diastereomer over other stereoisomers when multiple stereocentres are formed.

Synergistic catalysis: The use of two or more catalysts operating via distinct activation modes to achieve transformations not accessible by either catalyst alone.

Bimetallic catalysis: A cooperative catalytic approach employing two metal centres that can sequentially or concurrently activate different bonds or substrates.

References

1. Stereodivergent propargylic alkylation of enals via cooperative NHC and copper catalysis. Nature Communications (2022).
2. Stereodivergent dehydrative allylation of β-keto esters using a Ru/Pd synergistic catalyst. Nature Communications (2022).
3. Stereodivergent assembly of tetrahydro-γ-carbolines via synergistic catalytic asymmetric cascade reaction. Nature Communications (2019).
4. Bimetallic Ru/Ru‐Catalyzed Asymmetric One‐Pot Sequential Hydrogenations for the Stereodivergent Synthesis of Chiral Lactones. Advanced Science (2024).
5. Ligand-dependent, palladium-catalyzed stereodivergent synthesis of chiral tetrahydroquinolines. Chemical Science (2022).