Picolinamides and Iodoalkynes Enable Palladium‐Catalyzed syn‐Aminoalkynylation of Di‐ and Trisubstituted Alkenes to Give Pyrrolidines

Abstract

Palladium-catalyzed aminoalkynylation of electronically unbiased olefins with iodoalkynes is reported. The picolinamide auxiliary enables for the first time the syn-selective aminoalkynylation of mono-, diand trisubstituted alkenes to afford the corresponding pyrrolidines in up to 97 % yield and as single diastereomers. Furthermore, through a CÀ H activation approach, the picolinamide allows the rapid synthesis of functionalized olefins, which are suitable cyclization precursors. Facile and orthogonal deprotection of the amides and Si i Pr 3 -acetylenes in the products, and a subsequent Pictet-Spengler reaction is demonstrated.