Issue 11, 2024

Iridium-catalyzed asymmetric hydrogenation of 5-hydroxypicolinate pyridinium salts under batch and flow: stereodefined access to cis-configurated hydroxypiperidine esters

Abstract

The stereoselective synthesis of 2,5-disubstituted piperidines, which are common structural motifs in bioactive compounds and organocatalysts, remains a challenging task and is relatively rare. Herein, we report a novel iridium-catalyzed asymmetric hydrogenation of 5-hydroxypicolinate pyridinium salts for the first time. This asymmetric dearomatization strategy exhibits a broad substrate scope, enabling the synthesis of valuable cis-configurated hydroxypiperidine esters with distinct functionalities (ester, amino and hydroxy groups) in excellent yield and with excellent enantioselectivity and diastereoselectivity (up to 96% yield, 97% ee and >20 : 1 dr). The synthetic potential of this reaction is explored through gram-scale reactions and subsequent diverse transformations, leading to the generation of chiral amine scaffolds with substantial synthetic significance (such as crucial building blocks in the manufacturing of diazabicyclooctane β-lactamase inhibitors). The successful implementation of this approach in a continuous flow manner has additionally expanded its practical applicability. Consequently, this method expands the realm of catalytic asymmetric hydrogenation for N-heteroarenes.

Graphical abstract: Iridium-catalyzed asymmetric hydrogenation of 5-hydroxypicolinate pyridinium salts under batch and flow: stereodefined access to cis-configurated hydroxypiperidine esters

Supplementary files

Article information

Article type
Research Article
Submitted
20 Feb 2024
Accepted
16 Apr 2024
First published
18 Apr 2024

Org. Chem. Front., 2024,11, 3225-3233

Iridium-catalyzed asymmetric hydrogenation of 5-hydroxypicolinate pyridinium salts under batch and flow: stereodefined access to cis-configurated hydroxypiperidine esters

Z. Yang, S. Luan, L. Wan, J. Chen, X. Wei, P. Tang and F. Chen, Org. Chem. Front., 2024, 11, 3225 DOI: 10.1039/D4QO00322E

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