Copper/Titanium Catalysis Forms Fully Substituted Carbon Centers from the Direct Coupling of Acyclic Ketones, Amines, and Alkynes

Abstract

Three-component coupling, with a pair: The combination of CuII and TiIV catalyzes the first three-component coupling of unactivated ketones with a diverse range of amines and terminal alkynes. Tetrasubstituted propargylamines are formed under green, solvent-free conditions (see scheme). This dual metal system overcomes the barrier to ketimine formation and subsequent attack, opening a new path to multicomponent reactions of ketone electrophiles. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.