Assembly of Dihydropyridazines via [4+2] Cycloaddition of In Situ Generated Azoalkenes

Abstract The unprecedented example for the synthesis of multi‐substituted pyridazines via [4+2] cycloaddition of azoalkenes generated in situ is described. This protocol features broad substrate scope and allows rapid assembly of pyridazines. Notably, this process provides an alternative method for in situ generation of azoalkenes.