4.4 Article

Efficient synthesis of novel 2-spiropiperidines including an unprecedented non-symmetrical 2,6-bis-spiropiperidine

Journal

TETRAHEDRON LETTERS
Volume 65, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2020.152752

Keywords

Amino-beta-ketoester; Medicinal Chemistry; Spirocycle; Spirooxetane; Spiropiperidine

Funding

  1. University of Leeds

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A series of highly substituted 2-spiropiperidines were synthesized using a new method, enriching the conformationally distinct structural- and regio-isomers of previously reported compounds and expanding the potential for exploring three-dimensional chemical space.
Tertiary-alkyl substituted delta-amino-beta-ketoesters can be readily prepared from beta-amino acids, which can then undergo condensation with aldehydes to furnish novel, highly substituted 2-spiropiperidines. The method allows access to conformationally distinct structural- and regio-isomers of previously reported 2-spiropiperidines, and further expands the potential to explore three-dimensional chemical space. Using 3-oxetanone as the electrophile yielded the first example of a synthetically challenging non-symmetrical 2,6-bis-spiropiperidine. (C) 2021 Elsevier Ltd. All rights reserved.

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