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Visible-light-enabled spirocyclization of alkynes leading to 3-sulfonyl and 3-sulfenyl azaspiro[4,5]trienones

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Abstract

A mild and convenient visible-light-induced method has been developed for the construction of 3-sulfonyl and 3-sulfenyl azaspiro[4,5]trienones through metal-free difunctionalization of alkynes with sulfinic acids or thiols at room temperature. The present protocol simply utilizes visible light as the safe and eco-friendly energy source, and inexpensive and non-toxic organic dyes (Eosin Y and Na2-Eosin Y) as photocatalysts providing various sulfur-containing azaspiro[4,5]trienones in moderate to good yields.

Graphical abstract: Visible-light-enabled spirocyclization of alkynes leading to 3-sulfonyl and 3-sulfenyl azaspiro[4,5]trienones

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Publication details

The article was received on 01 Aug 2017, accepted on 20 Oct 2017 and first published on 24 Oct 2017


Article type: Paper
DOI: 10.1039/C7GC02330H
Citation: Green Chem., 2017, Advance Article
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    Visible-light-enabled spirocyclization of alkynes leading to 3-sulfonyl and 3-sulfenyl azaspiro[4,5]trienones

    W. Wei, H. Cui, D. Yang, H. Yue, C. He, Y. Zhang and H. Wang, Green Chem., 2017, Advance Article , DOI: 10.1039/C7GC02330H

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