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Issue 20, 2020
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Photoinduced, strain-promoted cycloadditions of trans-cycloheptenones and azides

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Abstract

An unprecedented photoinduced azide–alkene cycloaddition has been developed, the key elements of which include the photoisomerization of cis-cycloheptenone to trans-cycloheptenone, strain-promoted 1,3-dipolar cycloaddition of trans-cycloheptenone with azide, and aerobic oxidative aromatization of the resulting 1,2,3-triazoline. The newly developed photoclick reactions display several appealing features including high overall efficiency, broad substrate scope, environmentally benign conditions, and operational simplicity, which provide an enabling tool for accessing structurally diverse 1,2,3-triazoles. In addition, the photoisomerization–cycloaddition strategy could also be extended to the 1,3-dipolar cycloadditions of trans-cyclooctenone with azide and trans-cycloheptenone with nitrile oxide. More appealingly, the title reaction has been successfully applied as a bioconjugation tool for in vitro protein labeling.

Graphical abstract: Photoinduced, strain-promoted cycloadditions of trans-cycloheptenones and azides

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Article information


Submitted
10 Jul 2020
Accepted
04 Sep 2020
First published
04 Sep 2020

Green Chem., 2020,22, 7023-7030
Article type
Paper

Photoinduced, strain-promoted cycloadditions of trans-cycloheptenones and azides

H. Yang, T. Zeng, S. Xi, S. Hu, Y. Wu and Y. Tang, Green Chem., 2020, 22, 7023
DOI: 10.1039/D0GC02347G

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