Redox-neutral zinc-catalyzed cascade [1,4]-H shift /annulation of diaziridines with donor-acceptor aziridines

A Zn( ii )-catalyzed (3+2)-annulation of diaziridines with DA aziridines has been accomplished via 1,4-hydride shift to furnish imidazo[1,5- b ]pyrazole-4,4-dicarboxylates under mild reaction conditions.