What the study found
The study reports an oxidative desymmetrization of urea-protected pyrrolidines through site-selective hydride transfer from enantiotopic C-H bonds. The optimal oxoammonium-peptide conjugate catalyst gave over 90% 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 suggests this method may be useful for making such compounds.
What the researchers tested
The researchers tested oxidative desymmetrization of urea-protected pyrrolidines using an oxoammonium-peptide conjugate catalyst. They also isolated key on-cycle catalytic intermediates and analyzed a covalent catalyst-substrate adduct to study catalytic activation and stereochemical induction.
What worked and what didn't
The optimal catalyst provided over 90% ee across all tested pyrrolidines. The study also found a stereochemical model in which a tight hydrogen bond between the urea protecting group and the peptide directs asymmetric hydride transfer. The abstract does not describe failures or cases that did not work.
What to keep in mind
The available abstract does not describe experimental limitations, failed substrates, or scope boundaries beyond the tested pyrrolidines. The mechanistic explanation is based on isolated intermediates and a covalent adduct used as an analog of the enantiodetermining transition state.
Key points
- Urea-protected pyrrolidines were oxidatively desymmetrized by site-selective hydride transfer from enantiotopic C-H bonds.
- The optimal oxoammonium-peptide conjugate catalyst produced over 90% ee in all tested pyrrolidines.
- The products can reportedly undergo N-deprotection and other derivatization reactions to form medicinally relevant compounds.
- Key on-cycle catalytic intermediates were isolated to study catalytic activation and stereochemical induction.
- A tight hydrogen bond between the urea protecting group and the peptide was proposed as part of the stereochemical model.
Disclosure
- Research title:
- Oxoammonium catalysis enables enantioselective desymmetrization of meso-pyrrolidines
- Authors:
- Jonas Rein, Bartosz Górski, Ayça M Keskin, Minh Hoang Le, Song Lin
- Institutions:
- Cornell University
- Publication date:
- 2026-02-26
- DOI:
- 10.1021/jacs.5c20639
- OpenAlex record:
- View
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