Cobalt-catalyzed regioselective hydroazidation of 1-aryl-1,3-dienes: facile access to allylic azides

A new cobalt-catalyzed hydroazidation of 1-aryl-1,3-dienes by using TMSN 3 as a nucleophilic azide source under mild conditions has been reported, leading to the synthesis of a wide range of allylic azides with moderate to good yields.