Urea activation by an external brønsted acid: Breaking self-association and tuning catalytic performance

In this work, we hypothesize that Brønsted acids can activate urea-based catalysts by diminishing its self-assembly tendency. As a proof of concept, we used the asymmetric Friedel–Crafts alkylation of indoles with nitroalkenes as a benchmark reaction. The resulting 3-substituted indole derivatives w...

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Detalhes bibliográficos
Autores: Giménez Sonsona, I., Marqués-López, E., Häring, M., Díaz, D., Pérez Herrera, R.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2018
País:España
Recursos:Universidad de Zaragoza
Repositório:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:74967
Acesso em linha:http://zaguan.unizar.es/record/74967
Access Level:Acceso aberto
Descrição
Resumo:In this work, we hypothesize that Brønsted acids can activate urea-based catalysts by diminishing its self-assembly tendency. As a proof of concept, we used the asymmetric Friedel–Crafts alkylation of indoles with nitroalkenes as a benchmark reaction. The resulting 3-substituted indole derivatives were obtained with better results due to cooperative effects of the chiral urea and a Brønsted acid additive. Such synergy has been rationalized in terms of disassembly of the supramolecular catalyst aggregates, affording a more acidic and rigid catalytic complex.