2,6-Diazaheptatrienyl metal compounds 6–K+ are easily accessible from the corresponding diimines 6 by deprotonation using KO-t-Bu as base. According to quantum chemical calculations, they are, in comparison to other isomeric species with nitrogen atoms in other positions, highly reactive intermediates, which undergo in dilute solution at 50 °C ringclosurereactions to form 3-aminoindole derivatives