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Chiral Amino Alcohols via Catalytic Enantioselective Petasis Borono-Mannich Reactions

preprint
submitted on 14.06.2020 and posted on 16.06.2020 by John Kavouris, Kathryn Kavouris, Victor M. Wambua, Roman Demerzhan, Philip Moquist, Mathew Vetticatt, Scott Schaus
Chiral amino alcohols are valuable building blocks in the synthesis of drugs, natural products, and chiral ligands used in enantioselective catalysis. The Petasis borono-Mannich reaction is a multicomponent condensation reaction of aldehydes, amines, and boronic acids to afford chiral amines. This report describes a practical, easily scaled, enantioselective Petasis borono-Mannich reaction of glycolaldehyde, with primary or secondary amines, and boronates catalyzed by BINOLderived catalysts to afford chiral 1,2-amino alcohols in high yields and enantioselectivities. The reactions are executed at room temperature in ethanol or trifluorotoluene using commercially available reagents and leverage an inherently attractive feature of the multicomponent reaction; the ability to use amines and boronates that possess a wide range of structural and electronic properties. Computational modeling of the diastereomeric transition states using DFT calculations identified a non-conventional CH…O interaction as a key feature that selectively stabilizes the transition state leading to the major enantiomer. The enantioselective catalytic reaction exemplifies a truly practical multicomponent condensation to afford 1,2-amino alcohols in highly enantioenriched form.

Funding

Novel Concepts and Mechanistic Probes in Catalysis

National Institute of General Medical Sciences

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Enantioselective Catalytic Boronate Reactions

National Institute of General Medical Sciences

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History

Email Address of Submitting Author

seschaus@bu.edu

Institution

Boston University

Country

United States

ORCID For Submitting Author

0000-0002-5877-6587

Declaration of Conflict of Interest

The authors report no competing financial interests in connection with this research.

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