pyrrole formation by the reaction of vinylazides with 1,3-dicarbonyl compounds via the 1,2-addition of 1,3-dicarbonyl compounds to 2H-azirine intermediates generated in situ from vinylazides; (ii) the Cu(II)-catalyzed synthesis of pyrroles from alpha-ethoxycarbonyl vinylazides and ethyl acetoacetate through the 1,4-addition reaction of the acetoacetate to the vinylazides. By applying these two methods