Researchers Build 2-Component Chiral HAT Catalysts, Enabling Deracemization of 2-Aryl Pyrrolidines
Updated
Updated · Nature.com · Jun 1
Researchers Build 2-Component Chiral HAT Catalysts, Enabling Deracemization of 2-Aryl Pyrrolidines
5 articles · Updated · Nature.com · Jun 1
Non-covalent self-assembly of 2 components—a chiral phosphoric acid and commercial 2-mercaptopyridine—generated chiral hydrogen-atom-transfer catalysts in situ for photochemical deracemization.
That modular setup lets the phosphoric acid act as the interchangeable chiral element, making an otherwise achiral thiol effectively chiral and opening a previously inaccessible catalyst-combination space.
The system deracemized 2-aryl pyrrolidines, a scaffold common in active pharmaceutical ingredients, through an enantioselective hydrogen-atom relay in which one chiral assembly controls both abstraction and delivery.
The work addresses a longstanding obstacle in enantioselective HAT chemistry—controlling short-lived open-shell intermediates—and points to broader asymmetric radical transformations.
Could this breakthrough in non-covalent chiral assembly be applied to create advanced materials, not just catalysts?
Beyond its initial success, what are the stability and scalability challenges facing this new self-assembling catalyst?
Breakthrough in Enantioselective Hydrogen Atom Relay: In Situ Non-Covalent Catalyst Assembly for Chiral Pyrrolidine Synthesis
Overview
A landmark study published in Nature in 2026 introduced a transformative method for the enantioselective synthesis of 2-aryl pyrrolidines, addressing a major challenge in organic chemistry: the precise control of chirality. This breakthrough was first shared as preprints and focuses on the development of new ways to introduce or edit tertiary stereocenters, which are crucial because most biological functions depend on chiral molecules. The core innovation is the in situ generation of chiral hydrogen atom transfer (HAT) catalysts through non-covalent self-assembly, overcoming previous difficulties in achieving high enantiocontrol over reactive intermediates.