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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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Supplementary files

Article information


Submitted
12 Dec 2017
Accepted
30 Dec 2017
First published
04 Jan 2018

Org. Chem. Front., 2018,5, 1034-1038
Article type
Research Article

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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