Journal Pre-proofs Recyclable CuFe 2 O 4 for the synthesis of 2,3-disubstituted indoles Cuong M. Vu, Khoa B. Le, Uyen N. Vo, Vy D. T. Van, Anh T. Nguyen, Nam T. S. Phan, Nhan T. H. Le, Tung T. Nguyen PII: S0040-4039(20)31134-5 DOI: https://doi.org/10.1016/j.tetlet.2020.152629 Reference: TETL 152629 To appear in: Tetrahedron Letters Received Date: 18 September 2020 Revised Date: 25 October 2020 Accepted Date: 2 November 2020 Please cite this article as: Vu, C.M., Le, K.B., Vo, U.N., D. T. Van, V., Nguyen, A.T., T. S. Phan, N., T. H. Le, N., Nguyen, T.T., Recyclable CuFe 2 O 4 for the synthesis of 2,3-disubstituted indoles, Tetrahedron Letters (2020), doi: https://doi.org/10.1016/j.tetlet.2020.152629 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2020 Elsevier Ltd. All rights reserved.