Metal-free [2 + 2] and [4 + 2] cycloadditions ofN-aryl-substituted ynamides to construct functionalized aminocyclobutenes and 4-aminoquinolines

Metal-free [2 + 2] and [4 + 2] self-cycloadditions of N -aryl-substituted ynamides provide various valuable functionalized aminocyclobutenes and 4-aminoquinoline derivatives.