Publication: Enhancing the selectivity of prolinamide organocatalysts using the mechanical bond in [2]rotaxanes
Authors
Calles, Maria ; Puigcerver, Julio ; Alonso, Diego A. ; Alajarín, Mateo ; Martinez-Cuezva, Alberto ; Berná Cánovas, José
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Royal Society of Chemistry
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Abstract
The synthesis of a pair of switchable interlocked prolinamides and their use as organocatalysts in three different enamine-activated processes are reported. A diacylaminopyridine moiety was incorporated into the thread for directing [2]rotaxane formation further allowing the association of complementary small molecules. The rotaxane-based systems were tested as organocatalysts in asymmetric enamine-mediated processes, revealing a significantly improved catalytic ability if compared with the non-interlocked thread. The presence of an electron-withdrawing nitro group at the macrocycle helps to achieve high conversions and enantioselectivities. These systems are able to interact with N-hexylthymine as a cofactor to form supramolecular catalysts displaying a divergent catalytic behaviour. The presence or absence of the cofactor controls the chemoselectivity in competitive reactions.
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