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Chiral proline-substituted porous organic cages in asymmetric organocatalysis
The efficient preparation of chiral porous organic cages (POCs) with specific functions is challenging, and their application in asymmetric catalysis has not previously been explored. In this work, we have achieved the construction of chiral POCs based on a supramolecular tetraformyl-resorcin[4]aren...
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Published in: | Chemical science (Cambridge) 2022-03, Vol.13 (12), p.3582-3588 |
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description | The efficient preparation of chiral porous organic cages (POCs) with specific functions is challenging, and their application in asymmetric catalysis has not previously been explored. In this work, we have achieved the construction of chiral POCs based on a supramolecular tetraformyl-resorcin[4]arene scaffold with different chiral proline-modified diamine ligands and utilizing dynamic imine chemistry. The incorporation of V-shaped or linear chiral diamines affords the [4 + 8] square prism and [6 + 12] octahedral POCs respectively. The appended chiral proline moieties in such POCs make them highly active supramolecular nanoreactors for asymmetric aldol reactions, delivering up to 92% ee. The spatial distribution of chiral catalytic sites in these two types of POCs greatly affects their catalytic activities and enantioselectivities. This work not only lays a foundation for the asymmetric catalytic application of chiral POCs, but also contributes to our understanding of the catalytic function of biomimetic supramolecular systems.
Two calix[4]resorcinarene-based chiral POCs with different self-assembly forms were constructed. The difference in the spatial distribution of chiral organocatalytic sites leads to the two chiral POCs exhibiting distinct stereoselectivities. |
doi_str_mv | 10.1039/d2sc00395c |
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Two calix[4]resorcinarene-based chiral POCs with different self-assembly forms were constructed. 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Two calix[4]resorcinarene-based chiral POCs with different self-assembly forms were constructed. The difference in the spatial distribution of chiral organocatalytic sites leads to the two chiral POCs exhibiting distinct stereoselectivities.</abstract><cop>England</cop><pub>Royal Society of Chemistry</pub><pmid>35432868</pmid><doi>10.1039/d2sc00395c</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-4613-2151</orcidid><orcidid>https://orcid.org/0000-0002-5081-4032</orcidid><orcidid>https://orcid.org/0000-0001-9557-6982</orcidid><orcidid>https://orcid.org/0000-0003-4627-072X</orcidid><orcidid>https://orcid.org/0000-0003-1878-8062</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Aldehydes Biomimetics Cages Catalysis Chemistry Diamines Proline Spatial distribution |
title | Chiral proline-substituted porous organic cages in asymmetric organocatalysis |
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