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Article

Chiral Bifunctional Thioureas and Squaramides Grafted into Old Polymers of Intrinsic Microporosity for Novel Applications

Instituto CINQUIMA and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain
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Polymers 2019, 11(1), 13; https://doi.org/10.3390/polym11010013
Received: 23 November 2018 / Revised: 17 December 2018 / Accepted: 18 December 2018 / Published: 21 December 2018
(This article belongs to the Special Issue Recycling of Polymers and Multiphase Polymer-Based Systems)
We have prepared different polymeric chiral bifunctional thioureas and squaramides by modification of the very well-known polymers of intrinsic microporosity (PIM), specifically PIM-1 and PIM-CO-1, to be used as recoverable organocatalysts. The installation of the chiral structures into the polymers has been done in two or three steps in high yields. The catalytic activity of the resulting materials has been proved in the stereoselective nitro-Michael addition and in a cascade process, which allows the synthesis of enantioenriched 4H-chromene derivatives. Squaramide II and thiourea III have been used in six cycles maintaining their activity. View Full-Text
Keywords: organocatalysis; supported catalysts; polymers of intrinsic microporosity; asymmetric nitro-Michael reaction; thioureas; squaramides organocatalysis; supported catalysts; polymers of intrinsic microporosity; asymmetric nitro-Michael reaction; thioureas; squaramides
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MDPI and ACS Style

Valle, M.; Martín, L.; Maestro, A.; Andrés, J.M.; Pedrosa, R. Chiral Bifunctional Thioureas and Squaramides Grafted into Old Polymers of Intrinsic Microporosity for Novel Applications. Polymers 2019, 11, 13. https://doi.org/10.3390/polym11010013

AMA Style

Valle M, Martín L, Maestro A, Andrés JM, Pedrosa R. Chiral Bifunctional Thioureas and Squaramides Grafted into Old Polymers of Intrinsic Microporosity for Novel Applications. Polymers. 2019; 11(1):13. https://doi.org/10.3390/polym11010013

Chicago/Turabian Style

Valle, María, Laura Martín, Alicia Maestro, José M. Andrés, and Rafael Pedrosa. 2019. "Chiral Bifunctional Thioureas and Squaramides Grafted into Old Polymers of Intrinsic Microporosity for Novel Applications" Polymers 11, no. 1: 13. https://doi.org/10.3390/polym11010013

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