Synthesis of pyrrolizidines and indolizidines by multicomponent 1,3-dipolar cycloaddition of azomethine ylides

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Title: Synthesis of pyrrolizidines and indolizidines by multicomponent 1,3-dipolar cycloaddition of azomethine ylides
Authors: Nájera, Carmen | Sansano, Jose M.
Research Group/s: Síntesis Asimétrica (SINTAS)
Center, Department or Service: Universidad de Alicante. Departamento de Química Orgánica | Universidad de Alicante. Instituto Universitario de Síntesis Orgánica
Keywords: 1,3-dipolar cycloadditions | Azomethine ylides | Carbonyl compounds | Distinguished Women in Chemistry and Chemical Engineering | Electrophilic alkene | Iminium ions | Indolizidines | Multicomponent reactions | Pyrrolizidines
Knowledge Area: Química Orgánica
Issue Date: 24-Apr-2019
Publisher: De Gruyter
Citation: Pure and Applied Chemistry. 2019, 91(4): 575-596. doi:10.1515/pac-2018-0710
Abstract: Different multicomponent 1,3-dipolar cycloadditions (1,3-DC) of cyclic α-amino acid derivatives with aldehydes and dipolarophiles have been described as efficient and simple methodologies for the synthesis of the pyrrolidine unit of pyrrolizidines and indolizidines. When free cyclic α-amino acids are used, a thermal promoted decarboxylative process generates in situ the corresponding non-stabilized azomethine ylides, which afforded the corresponding pyrrolizidines and indolizidines with a hydrogen in the bicyclic units. This methodology has been employed to the synthesis of complex systems including spiro derivatives when ketones are used as carbonyl component. In addition, working with cyclic α-amino acid derived esters, the three-component 1,3-DC takes place under milder reaction conditions giving the corresponding pyrrolizidines and indolizidines with an alkoxycarbonyl group in the bridge adjacent carbon to the nitrogen. This methodology can be carried out by a double consecutive or stepwise 1,3-DC to provide pyrrolizidines via the precursor prolinates. The conformation of the azomethine ylide controls the endo/exo diastereoselectivity of the 1,3-DC.
Sponsor: We gratefully acknowledge financial support from the Spanish Ministerio de Economía y Competitividad (MINECO) (projects CTQ2013-43446-P and CTQ2014-51912-REDC), the Spanish Ministerio de Economía, Industria y Competitividad, Agencia Estatal de Investigación (AEI) and Fondo Europeo de Desarrollo Regional (FEDER, EU) (projects CTQ2016-76782-P and CTQ2016-81797-REDC), the Generalitat Valenciana (PROMETEOII/2014/017) and the University of Alicante.
ISSN: 0033-4545 (Print) | 1365-3075 (Online)
DOI: 10.1515/pac-2018-0710
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 IUPAC & De Gruyter. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. For more information, please visit:
Peer Review: si
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Appears in Collections:INV - SINTAS - Artículos de Revistas

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