Synthesis
DOI: 10.1055/a-2640-6415
paper
Special Topic Dedicated to Prof. Paul Knochel

Organocatalytic Enantioselective Nitro-Vinylcyclopropane-Cyclopentene Rearrangement: Expanding the Reactivity of Donor–Acceptor Cyclopropanes

Lorena García
Department of Organic and Inorganic Chemistry, University of the Basque Country (UPV/EHU), Bilbao, Spain
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Department of Organic and Inorganic Chemistry, University of the Basque Country (UPV/EHU), Bilbao, Spain
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Department of Organic and Inorganic Chemistry, University of the Basque Country (UPV/EHU), Bilbao, Spain
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Uxue Uria
Department of Organic and Inorganic Chemistry, University of the Basque Country (UPV/EHU), Bilbao, Spain
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Department of Organic and Inorganic Chemistry, University of the Basque Country (UPV/EHU), Bilbao, Spain
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Department of Organic and Inorganic Chemistry, University of the Basque Country (UPV/EHU), Bilbao, Spain
› Institutsangaben

Gefördert durch: Basque Government IT1558-22
Gefördert durch: Agencia Estatal de Investigación BES-2015-072454,PID2023-146950NB-I00,RED2022-134331-T
Gefördert durch: Euskal Herriko Unibertsitatea N23/30,N23/48
Funding Information Financial support obtained by Grant PID2023-146950NB-I00 funded by MICIU/AEI/ 10.13039/501100011033 and by “ERDF/EU”. Also, financial support by Grant RED2022-134331-T funded by MICIU/AEI/ 10.13039/501100011033 and Grant BES-2015-072454 funded by MICIU/AEI/10.13039/501100011033 and by “ESF Investing in your future”. In addition, funding has been provided by the Basque Government (Grupos IT1558-22) and by the University of the Basque Country (EHU-N23/48 and EHU-N23/30).


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Dedication

Dedicated to Professor Paul Knochel on the occasion of his 70th birthday.

Abstract

The catalytic enantioselective rearrangement of nitro-vinylcyclopropylacetaldehydes has been studied using chiral secondary amines as catalysts. The reaction proceeds through the in situ generation of a donor–acceptor cyclopropane, which rearranges to the corresponding cyclopentene through an open conjugated iminium/unsaturated nitronate intermediate, where the stereochemistry of the starting cyclopropane is lost. This intermediate undergoes an intramolecular Michael reaction in which the asymmetric induction provided by the catalyst allows the preparation of substituted nitrocyclopentenes in good yields and with high stereocontrol. The obtained 2-nitrocyclopentenylacetaldehydes have been transformed into valuable chiral cyclopentenones through Nef reaction with complete retention of the stereochemical information.

Supplementary Material



Publikationsverlauf

Eingereicht: 19. Mai 2025

Angenommen nach Revision: 20. Juni 2025

Accepted Manuscript online:
20. Juni 2025

Artikel online veröffentlicht:
31. Juli 2025

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