Copper-Catalyzed Oxidative Thioamination of Maleimides with Amines and Bunte Salts.

Herein, we describe the first example of copper-catalyzed oxidative thioamination of maleimides with secondary amines and Bunte salts with the achievement of C-N and C-S bonds in a single flask. The protocol showcases a prominently broad substrate scope and is also efficient for the late-stage modification of an array of pharmaceuticals. Preliminary mechanistic investigation indicates copper-catalyzed oxidative amination of maleimides with amines to form reactive enaminone and subsequent intermolecular alkenyl C-H thiolation.