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Recyclable catalyst for the asymmetric Henry reaction based on functionalized imidazolidine-4-one-copper(II) complexes supported by a polystyrene copolymer
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Tetrahedron Letters
Publisher name: Pergamon-Elsevier Science Ltd.
Place: Oxford
Page from-to: 6240-6243
Titles:
Language Name Abstract Keywords
cze Recyklovatelný katalyzátor pro asymetrickou Henryho reakci, založený na funkcionalizovaném měďnatém komplexu imidazolidin-4-onu vázaném na polystyrenu copolymer Imidazolidin-4-onové deriváty byly připojeny thiol-enovou klik-reakcí na botnatelný perlový kopolymer polystyrenu a jejich komplexy s Cu(II) acetátem byly použity jako recykovatelné heterogenní katalyzátory pro Henryho reakci substituovaných aldehydů s nitromethanem. Odpovídající 2-nitroethanoly byly většinou získány v dobrých výtěžcích (65-99%) a s enantioselectivitami až 92% ee. Po 5 katalytických cyklech poklesla enantioselektivita pouze zanedbatelně (o 3% ee). Imidazolidin-4-ony; recyklovatelné enantioselektivní katalyzátory; Henryho reakce; Polystyren
eng Recyclable catalyst for the asymmetric Henry reaction based on functionalized imidazolidine-4-one-copper(II) complexes supported by a polystyrene copolymer Imidazolidine-4-one derivatives were anchored by the thiol-ene click reaction to a swellable pearl-like polystyrene copolymer and their complexes with Cu(II) acetate were utilized as recyclable heterogeneous catalysts for the Henry reaction of substituted aldehydes with nitromethane. The corresponding 2-nitroethanols were mostly obtained in high yields (65-99%) and with enantioselectivities of up to 92% ee. After a fivefold recycling of the catalyst, the decrease in enantioselectivity was negligible (Delta 3% ee). Imidazolidine-4-one derivatives; Recyclable enantioselective catalyst; Henry reaction; Polystyrene

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