Recent Developments in Copper(I)‐Catalyzed Enantioselective Alkynylation Reactions via a Radical Process.

Comprehensive Summary: Alkynes are one of the most significant functional groups in organic chemistry and great efforts have been made to explore efficient approach for the construction of chiral alkynes. The asymmetric C(sp3)–C(sp) cross‐coupling provides a significant complementary strategy through radical‐initiated process. However, the stereocontrol of highly reactive and unstable radical intermediate has been a challenge for decades. To address this problem, a variety of chiral ligands are developed for initiating the reaction and achieving enantiocontrol of alkyl radicals. This review summarizes recent developments in copper‐catalyzed enantioselective alkynylation of prochiral alkyl radicals and their brief mechanistic studies. [ABSTRACT FROM AUTHOR]