A number of N-substituted cyclic enediynes (azaenediynes) have been synthesized via Pd(0)-catalysed ene–yne coupling followed by N-alkylation. The simplest of them, a 10-membered monocyclic enediyne 1, underwent Bergman cyclization (BC) at 23 °C with a half-life of 72 h. The kinetics of BC slowed down considerably by fusing a benzene ring onto the enediyne. Several novel bis(azaenediyne)s and bis(diazaenediyne)s 3–6 have been synthesized. Their onset temperatures for BC were lowered under metal ion complexation conditions.