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.
通过
钯(0)催化的烯-炔偶联和 N-烷基化,合成了许多 N-取代的环烯二炔(azaenediynes)。其中最简单的一种 10 元单环烯二炔 1 在 23 ℃ 下发生伯格曼环化反应(BC),半衰期为 72 小时。我们合成了几种新型双(氮杂二炔)和双(二氮杂二炔)3-6。在
金属离子络合条件下,它们的 BC 起始温度降低了。