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Updated: Nov 8, 2025

Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
Published on: September 8, 2013
Visible-light-mediated cascade cyanoalkylsulfonylation/cyclization of alkynoates leading to coumarins via SO2
Pu Chen1, Zan Chen, Bi-Quan Xiong
1Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China. lyxtmj_613@163.com xiejun12018014@163.com.
Abstract:
A visible-light-mediated tandem cyanoalkylsulfonylation/cyclization of alkynoates with cycloketone oxime compounds for the preparation of 3-cyanoalkylsulfonylcoumarins via SO2 insertion is reported. The difunctionalization of carbon-carbon triple bonds includes a radical mechanism and involves the formation of an iminyl radical, ring-opening of the cycloketone, insertion of SO2, addition of the sulfonyl radical to carbon-carbon triple bonds, ipso-cyclization and ester migration.
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