What the study found
The study found that urea-protected pyrrolidines can be oxidatively desymmetrized by site-selective hydride transfer from enantiotopic C–H bonds. The optimal oxoammonium–peptide conjugate catalyst gave over 90% enantiomeric excess, or ee, across all tested pyrrolidines.
Why the authors say this matters
The authors say the products can readily undergo N-deprotection and other derivatization reactions to form medicinally relevant compounds. The study also suggests that identifying catalytic intermediates can clarify how the catalyst activates the reaction and how stereochemistry is induced.
What the researchers tested
The researchers tested oxidative desymmetrization of urea-protected pyrrolidines using oxoammonium–peptide conjugate catalysts. They isolated key on-cycle catalytic intermediates and analyzed a covalent catalyst–substrate adduct to study the mechanism and stereochemical induction.
What worked and what didn't
The optimal catalyst provided over 90% ee for all pyrrolidines tested. The abstract does not report specific cases that failed or performed poorly.
What to keep in mind
The available summary does not describe the full range of substrates, experimental conditions, or any limitations beyond the tested pyrrolidines. It also does not provide detailed comparative data for catalysts other than the optimal one.
Key points
- Urea-protected pyrrolidines were oxidatively desymmetrized by site-selective hydride transfer.
- The best oxoammonium–peptide conjugate catalyst gave over 90% ee across all tested pyrrolidines.
- Key on-cycle catalytic intermediates were isolated.
- A covalent catalyst–substrate adduct was used as an isolable analog of the enantiodetermining transition state.
- The authors report a stereochemical model in which a tight hydrogen bond between the urea protecting group and the peptide directs asymmetric hydride transfer.
Disclosure
- Research title:
- Oxoammonium catalysis desymmetrized meso-pyrrolidines with high enantioselectivity
- Authors:
- Jonas Rein, Bartosz Górski, Ayça M Keskin, Minh Hoang Le, Song Lin
- Institutions:
- Cornell University, Cornell University, Cornell University, Cornell University, Cornell University
- Publication date:
- 2026-02-26
- DOI:
- 10.1021/jacs.5c20639
- OpenAlex record:
- View
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