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Issue 6, 2018
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Elemental sulfur accelerated the reactivity of the 3-position of indole for the construction of chromeno[2,3-b]indoles

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Abstract

An intermolecular cross-cyclization between salicylaldehydes and indoles for the preparation of chromeno[2,3-b]indole derivatives was successfully developed by using elemental sulfur as the promoter and oxidant. Various chromeno[2,3-b]indoles can be prepared using indoles and salicylaldehydes bearing different functional groups. The preliminary mechanistic investigations demonstrated that elemental sulfur not only acted as an additional oxidant but also facilitated the reactivity of the 3-position of indole.

Graphical abstract: Elemental sulfur accelerated the reactivity of the 3-position of indole for the construction of chromeno[2,3-b]indoles

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Publication details

The article was received on 12 Dec 2017, accepted on 30 Dec 2017 and first published on 04 Jan 2018


Article type: Research Article
DOI: 10.1039/C7QO01114H
Citation: Org. Chem. Front., 2018,5, 1034-1038
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    Elemental sulfur accelerated the reactivity of the 3-position of indole for the construction of chromeno[2,3-b]indoles

    J. Liu, X. Yan, N. Liu, Y. Zhang, S. Zhao, X. Wang, K. Zhuo and Y. Yue, Org. Chem. Front., 2018, 5, 1034
    DOI: 10.1039/C7QO01114H

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