One catalyst enables two asymmetric routes to complex molecules

Researchers at Sungkyunkwan University have developed two asymmetric catalytic methods for assembling complex molecules with precise control over reaction sites and three-dimensional structure. Led by chemistry professor Do Hyun Ryu, the team showed that a single chiral organic catalyst can promote two distinct carbon–carbon bond-forming reactions with high selectivity. In a separate study, the researchers designed a reaction that builds tetrahydrofuran rings containing multiple stereocenters from simple starting materials. Both peer-reviewed studies were published in Angewandte Chemie International Edition.

The first method, developed with a team led by Hyunwoo Kim at the Korea Advanced Institute of Science and Technology, provides a unified catalytic platform for asymmetric allylation and Mukaiyama aldol reactions involving 1,2-dicarbonyl compounds. The same chiral catalyst could direct both transformations, including a highly selective asymmetric allylation reaction that had previously been difficult to control. According to the university’s news release, the catalyst selectively activates the intended reaction site while controlling the arrangement of atoms in the resulting chiral products.

Beyond the direct formation of the reaction products, the researchers demonstrated that the resulting compounds could be converted into a variety of further useful molecules. The method was also applied to the synthesis of the biologically active natural product (+)-dimethyl citramalate. Density functional theory calculations supported the proposed explanation for how the catalyst governs both site selectivity and the three-dimensional configuration of the products. These results are laboratory demonstrations of synthetic methodology, rather than evidence that the reactions are ready for scaled pharmaceutical production.

The second study addresses a different challenge: constructing a five-membered ring containing one oxygen atom, known as a tetrahydrofuran, with several stereocenters. Such ring systems are important structural frameworks in many biologically active natural products and pharmaceuticals. Conventional approaches to complex three-dimensional structures often depended on starting materials that already possessed a particular stereochemical arrangement. Ryu’s team instead used a chiral organic catalyst to form multiple stereocenters from simple starting materials without pre-existing stereocenters.

The resulting tetrahydrofuran compounds could be transformed into more complex structures, and the researchers applied the reaction to prepare a synthetic intermediate for (+)-altholactone, a natural product reported to have anticancer activity. That application demonstrates a route to a specific natural-product intermediate; it does not by itself establish anticancer efficacy in humans or constitute a clinical evaluation of a therapeutic candidate. Together, the two studies show how catalyst design can alter which bonds form and how molecular architecture develops during synthesis.

The broader significance lies in the strategy of controlling several stereochemical features at once, a persistent difficulty in organic synthesis. The first platform emphasizes reuse of one catalyst across two different reaction classes, while the second emphasizes assembling a stereochemically rich ring from comparatively simple inputs. The research was supported by National Research Foundation of Korea and Korea Basic Science Institute grants funded by Korean government ministries. Ryu said the approaches may be extended to a wider range of asymmetric reactions, although that expansion remains a prospect rather than a demonstrated result of the studies.

Subject of Research: Development of chiral organocatalysts for highly selective asymmetric synthesis of complex molecules

Article Title: SKKU developing new asymmetric catalytic reactions for the synthesis of complex molecules

Article References: SKKU developing new asymmetric catalytic reactions for the synthesis of complex molecules. Original publication (Bibliographic details unavailable.)

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Keywords: asymmetric synthesis, chiral organocatalysis, carbon–carbon bonds, stereocenters, tetrahydrofuran rings, allylation reactions, aldol reactions, natural products, density functional theory, Sungkyunkwan University, SKKU, developing