Copper‐Catalyzed 1,2,5‐Trifunctionalization of Terminal Alkynes Using SR as a Transient Directing Group for Radical Translocation

Comprehensive Summary The first Cu‐catalyzed 1,2,5‐trifunctionalization of abundant terminal alkynes is realized by merging hydrogen atom transfer and traceless directing strategy with SR as a transient group, delivering highly functionalized aldehydes in moderate to excellent yields with broad substrate scope. The synthetic utility of this method was demonstrated by the gram‐scale reaction and downstream transformations of the resultant products. Given the high efficient installation of three different functional groups in a single reaction, it can serve as a very attractive method for rapidly assembling complex molecules from readily available starting materials.