A palladium catalyzed domino reaction of 1,4-disubstituted triazoles involving homo- and heterocondensation is presented. The approach provides a simple, straight forward and a facile route to access triazolo[1,5-f]phenanthridines in high yields.
Various o-alkenyl aromatic isocyanides were prepared from readily available reactants for their double annulation with diazo compounds for a one-pot synthesis of pyrazolo[1,5-c]quinazolines under mild reaction conditions.