Silica-Supported Phosphine-Gold Complexes as an Efficient Catalytic System for a Dearomative Spirocyclization.
circular dichroism
gold
helical structures
silicon
spirocyclization
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Titre abrégé: Chemistry
Pays: Germany
ID NLM: 9513783
Informations de publication
Date de publication:
04 Jan 2021
04 Jan 2021
Historique:
received:
19
09
2020
revised:
08
10
2020
pubmed:
17
10
2020
medline:
17
10
2020
entrez:
16
10
2020
Statut:
ppublish
Résumé
The combination of metal catalyst and inorganic silica frameworks provides a greener approach to recyclable catalysis. In this study, three phosphine-gold chloride complexes have been successfully covalently grafted onto chiral silica nanohelices. The resulting 3D ensembles showed chiroptical properties that allowed the monitoring of the supported ligands. The heterogeneous gold chloride catalysts in cooperation with silver triflate exhibited high reactivity in various reactions, especially in the spirocyclization of aryl alkynoate esters, for which a catalytic loading of 0.05 mol % could be employed. The heterogeneous catalysts could be easily recovered and recycled seven or eight times without any loss of efficiency. By adding more silver triflate, 25 cycles with full conversion were achieved owing to a complex catalytic system based on silica and metallic species.
Identifiants
pubmed: 33064331
doi: 10.1002/chem.202004251
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
427-433Subventions
Organisme : China Scholarship Council
Informations de copyright
© 2020 Wiley-VCH GmbH.
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