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Synthesis 2023; 55(17): 2683-2690
DOI: 10.1055/a-2067-4099
DOI: 10.1055/a-2067-4099
paper
Cu(OTf)2/TBHP/O2-Mediated Tandem Oxidative Reaction: Easy Access to Benzopyrano[4,3-b]pyridines
This work was supported by the National Natural Science Foundation of China (22078300).

Abstract
An effective tandem reaction of 4-aminocoumarins and 1,3-diarylpropenes mediated by Cu(OTf)2/TBHP (tert-butyl hydroperoxide)/O2 that provides various benzopyrano[4,3-b]pyridines in moderate to good yields is disclosed. The reaction proceeds through oxidative coupling, intramolecular cyclization, and dehydro-aromatization. This approach has the advantages of high atom-economy, environmental compatibility, and wide substrate scope.
Key words
tandem reaction - oxidative coupling - TBHP - 4-aminocoumarin - benzopyrano[4,3-b]pyridinesSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-2067-4099.
- Supporting Information
Publication History
Received: 07 February 2023
Accepted after revision: 31 March 2023
Accepted Manuscript online:
31 March 2023
Article published online:
08 May 2023
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