Synthesis of Cyclopenta[b]piperazinones via an Azaoxyallyl Cation

A new and efficient reaction sequence between 2-furylcarbinols, anilines, and α-haloamides has been developed to afford highly functionalized cyclopenta­[b]­piperazinones. This transformation was accomplished through an aza-Piancatelli cyclization/azaoxyallyl cation trapping with a complete control of the diastereoselectivity.