Exploration of forbidden Povarov processes as a source of unexpected reactivity: a multicomponent Mannich-Ritter transformation

Abstract

When a door closes, a window opens! The use of geometrically or electronically restricted imines for Povarov-type processes does not afford the anti-Bredt tetrahydroquinolines, but leads instead to highly functionalized structures through novel reaction pathways (see picture; LA=Lewis acid). The exploration of "forbidden" routes constitutes a valuable approach in the search for new multicomponent reactions.