H5PW10V2O40@VOx/SBA-15-NH2 catalyst for the solventless synthesis of 3-substituted indoles

Ghohe, N, Tayebee, R, Amini, M, Osatiashtiani, A, Isaacs, M and Lee, A 2017, 'H5PW10V2O40@VOx/SBA-15-NH2 catalyst for the solventless synthesis of 3-substituted indoles', Tetrahedron, vol. 73, no. 40, pp. 5862-5871.


Document type: Journal Article
Collection: Journal Articles

Title H5PW10V2O40@VOx/SBA-15-NH2 catalyst for the solventless synthesis of 3-substituted indoles
Author(s) Ghohe, N
Tayebee, R
Amini, M
Osatiashtiani, A
Isaacs, M
Lee, A
Year 2017
Journal name Tetrahedron
Volume number 73
Issue number 40
Start page 5862
End page 5871
Total pages 10
Publisher Elsevier
Abstract Functionalization of mesoporous SBA-15 frameworks by transition metal oxides offers a flexible route to fabricate new heterogeneous catalysts. Here, an inorganic-organic hybrid nanoporous catalyst H5PW10V2O40@VOx/SBA-15-NH2, was prepared and utilized as an efficient, eco-friendly, and recyclable catalyst for the one-pot, multi-component synthesis of 3-substituted indoles by indole substitution with aldehydes and malononitrile under solvent-free conditions. Catalysts were prepared by the non-covalent attachment of H5PW10V2O40 to a 3 wt%VOx/SBA-15 nanoporous support through a 3-(triethoxysilyl)propylamine linker. VOx/SBA-15 was prepared by a one-pot hydrothermal synthesis from TEOS and vanadium(V) oxytri-tert-butoxide [VO(O-tBu)3]. The resulting H5PW10V2O40@VOx/SBA-15-NH2 material was characterized by bulk and surface analysis including N2 porosimetry, FE-SEM, XRD, XPS, FT-IR, TGA-DTA, UVVis and ICP-OES, evidencing retention of the heteropolyacid Keggin structure. H5PW10V2O40@VOx/SBA-15-NH2 exhibits high activity and excellent yields (7095%) of 3-substituted indoles under mild conditions, with negligible deactivation.
Subject Catalysis and Mechanisms of Reactions
Keyword(s) 3-Substituted indoles
Heteropolyacid
SBA-15
Solventless
Vanadia
DOI - identifier 10.1016/j.tet.2017.08.030
Copyright notice © 2017 Elsevier Ltd
ISSN 0040-4020
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