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oai:uvadoc.uva.es:10324/339172025-03-26T19:10:17Zcom_10324_1187com_10324_931com_10324_894com_10324_28542com_10324_952col_10324_1408col_10324_28543

2019-01-11T12:01:32Z urn:hdl:10324/33917 Chiral Bifunctional Thioureas and Squaramides Grafted into Old Polymers of Intrinsic Microporosity for Novel Applications Valle Álvarez, María Martín Maroto, Laura Maestro Fernández, Alicia Andrés García, José María Pedrosa Sáez, Rafael Producción Científica 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 2019-01-11T12:01:32Z 2019-01-11T12:01:32Z 2019 info:eu-repo/semantics/article Polymers 2019, 11(1), 13 2073-4360 http://uvadoc.uva.es/handle/10324/33917 10.3390/polym11010013 eng https://www.mdpi.com/2073-4360/11/1/13 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Attribution-NonCommercial-NoDerivatives 4.0 International MDPI