Single‐Atom Cobalt‐Catalyzed Transfer Hydrogenation of Azides and One‐Pot Synthesis of Pyrroles

Abstract In this work, a single‐atom cobalt‐catalyzed transfer hydrogenation (TH) of azides is reported under mild conditions (at 30 °C in 30 min) using NH 2 NH 2 ⋅ H 2 O as the hydrogen source. Employing this protocol, a wide range of azides were transformed to their corresponding amines. This methodology was extended towards the synthesis of several important N‐substituted pyrroles from azides in one‐pot manner. The control experiments suggested, the transfer hydrogenation favoured by electron withdrawing substituents and one‐pot pyrrole synthesis favoured by electron‐donating substituents. The recyclability test revealed the catalysts could be recycled up to 7 th times without significant loss in the catalytic activity.