access to the allenic cyclophane 8. The macrocycles 13 and 17 with the allenic bridge between the aromatic units were also obtained efficiently by copper-promoted S N 2'-substitution of propargylic acetates and ring-closing metathesis. Alternatively, macrocyclic allenes can be synthesized by ring-closing metathesis of α,ω-bisallenes, as was demonstrated by the formation of the products 20, 21, and 23.
描述了几种有效的合成方法,合成具有通用结构 2/3 的
丙二烯环
芳烃,它们作为手性
配体或宿主分子很受关注。
钌催化的闭环复分解和使用 Seyferth 试剂 PhHgCBr 3 的 Doering-Moore-Skattebel (
DMS) 反应的组合提供了获得
丙二烯环烷 8 的直接途径。 大环 13 和 17 与
芳烃单元之间的
丙二烯桥还通过
铜促进的 SN 2'-
丙炔乙酸酯的取代和闭环复分解有效地获得。或者,大环
丙二烯可以通过 α,ω-双
丙二烯的闭环复分解合成,如产物 20、21 和 23 的形成所示。