Photoredox Synthesis of Thio‐Functionalized Cyclic Ethers Using N‐Sulfenyl Phthalimides as a Thiyl‐Radical Precursor

Comprehensive Summary A visible‐light mediated exclusively regioselective synthesis of 2,2‐disubstituted thio‐functionalized tetrahydrofurans, tetrahydro‐ pyrans and oxepanes has been described through an operationally simple and mild photoredox protocol. Thiyl radical generated from N ‐phenylsulfenyl phthalimide by photoredox catalysis was proven to be the key reactive intermediate in this reaction.