Design and Synthesis of Fluoro‐containing Hypervalent Iodane (III) Reagents for Visible‐light‐triggered Cyclization of Alkynoates to 3‐fluoroalkylated Coumarins

A series of novel fluoro-containing hypervalent iodane (III) reagents was designed and synthesized. By employing these novel hypervalent iodane (III) reagents, an efficient visible-light-triggered radical cyclization of alkynoates to diversely 3-fluoroalkylated coumarins was developed under metal free condition. It provided an alternative and environmental friendly approach for the installation of 3-fluoroalkyl motif into synthetically valuable building block coumarins.