Ruthenium-Catalyzed C−C Bond Cleavage of 2<i>H</i>
-Azirines: A Formal [3+2+2] Cycloaddition to Fused Azepine Skeletons
作者:Tengfei Li、Fen Xu、Xincheng Li、Chunxiang Wang、Boshun Wan
DOI:10.1002/anie.201510820
日期:2016.2.18
2H‐azirines can serve as three‐atom synthons by C−C bond cleavage, however, it involves a high energy barrier under thermal conditions (>50.0 kcal mol−1). Reported is a ruthenium‐catalyzed [3+2+2] cycloaddition reaction of 2H‐azirines with diynes, thus leading to the formation of fused azepine skeletons. This approach features an unprecedented metal‐catalyzed C−C bond cleavage of 2H‐azirines at room
2 H azi嗪可通过C-C键断裂充当三原子合成子,但是,它在热条件下(> 50.0 kcal mol -1)具有高能垒。据报道,钌是2 H-叠氮基与二炔的钌催化[3 + 2 + 2]环加成反应,从而导致形成稠合的氮杂骨架。这种方法的特点是在室温下前所未有的金属催化2 H叠氮基的C-C键断裂,以及由二炔构成的氮杂七元环的具有挑战性的构建。这项研究的结果为构建含氮七元环提供了一种新的反应模式,并可能在其他复杂杂环的合成中得到应用。