Publication: Mechanical bonding activation in rotaxane-based organocatalysts
Authors
Pérez Martínez, Jesús de Maria ; Puigcerver, Julio ; Orlando, Tainara ; Martins, Marcos A. P. ; Alajarín, Mateo ; Martinez-Cuezva, Alberto ; Berná Cánovas, José ; Pastor, Aurelia
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Publisher
Royal Society of Chemistry
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DOI
https://doi.org/10.1039/D1QO00789K
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info:eu-repo/semantics/article
Description
©2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the Accepted, version of a Published Work that appeared in final form in [Organic Chemistry Frontiers]. To access the final edited and published work see[https://doi.org/10.1039/D1QO00789K]
Abstract
We report here the enhanced efficiency as organocatalysts of a series of succinamide-based hydrogen-bonded [2]rotaxanes functionalized with an acyclic secondary amine as the catalytic active site. We also evaluated their catalytic activity, comparing with that of their non-interlocked threads, in an iminium-type process between crotonaldehyde and acetylacetone. The presence of an interlocked polyamide macrocycle notably increased the catalytic activity of the entwined organocatalysts. The mechanized catalysts rapidly form the reactive iminium intermediate with the aldehyde, increasing its population. The hydrogen-bonding interaction established between the macrocycle and the electrophile has been proposed as one of the reasons for the rapid formation and stabilization of this key intermediate.
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Citation
Organic Chemistry Frontiers, 2021, 8, 4202-4210.
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