Unexpected Formation of (E)-4-Alkene 1,3-Diketones from the Three-Component Reaction of Lithium Selenolates with 1-(1-Alkynyl)cyclopropyl Ketones and Aldehydes

A novel three-component stereoselective synthesis of (E)-4-alkene 1,3-diketones from lithium selenolates, 1-(1-alkynyl)cyclopropyl ketones, and aldehydes is reported. This reaction afforded the products in moderate to good yields with the formation of a new C-Se single bond, a new C-C double bond, and a new C-O double bond.