Volume 135, Issue 2 e202212528
Forschungsartikel

Economical Access to Diverse Enantiopure Tetrahydropyridines and Piperidines Enabled by Catalytic Borrowing Hydrogen

Teng Wei Ng

Teng Wei Ng

Department of Chemistry, National University of Singapore, 4 Science Drive 2, Singapore, 117544 Republic of Singapore

These authors contributed equally to this work.

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Ran Tao

Ran Tao

Department of Chemistry, National University of Singapore, 4 Science Drive 2, Singapore, 117544 Republic of Singapore

Integrative Sciences and Engineering Programme, NUS Graduate School, National University of Singapore, 21 Lower Kent Ridge Road, Singapore, 119077 Singapore

These authors contributed equally to this work.

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Willy Wei Li See

Willy Wei Li See

Department of Chemistry, National University of Singapore, 4 Science Drive 2, Singapore, 117544 Republic of Singapore

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Si Bei Poh

Si Bei Poh

Department of Chemistry, National University of Singapore, 4 Science Drive 2, Singapore, 117544 Republic of Singapore

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Yu Zhao

Corresponding Author

Yu Zhao

Department of Chemistry, National University of Singapore, 4 Science Drive 2, Singapore, 117544 Republic of Singapore

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First published: 14 November 2022
Citations: 1

Abstract

We disclose herein a catalytic borrowing hydrogen method that enables an unprecedented, economical one-pot access to enantiopure tetrahydropyridines with minimal reagent use or waste formation. This method couples a few classes of readily available substrates with commercially available 1,3-amino alcohols, and delivers the valuable tetrahydropyridines of different substitution patterns free of N-protection. Such transformations are highly challenging to achieve, as multiple redox steps need to be realized in a cascade and numerous side reactions including a facile aromatization have to be overcome. Highly diastereoselective functionalizations of tetrahydropyridines also result in a general access to enantiopure di- and tri-substituted piperidines, which ranks the topmost frequent N-heterocycle in commercial drugs.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.