One-pot synthesis of dicyclopenta-fused peropyrene via a fourfold alkyne annulation
作者:Ji Ma、Yubin Fu、Junzhi Liu、Xinliang Feng
DOI:10.3762/bjoc.16.72
日期:——
A novel dicyclopenta-fused peropyrene derivative 1 was synthesized via a palladium-catalyzed four-fold alkyne annulation of 1,3,6,8-tetrabromo-2,7-diphenylpyrene (5) with diphenylacetylene. The annulative π-extension reaction toward 1 involved a twofold [3 + 2] cyclopentannulation and subsequent twofold [4 + 2] benzannulation. The structure of 1 is unambiguously confirmed by X-ray crystallography;
通过钯催化 1,3,6,8-四溴-2,7-二苯基芘 (5) 与二苯基乙炔的四重炔环化合成了一种新型二环五稠合的芘衍生物 1。向 1 的环 π 延伸反应涉及双重 [3 + 2] 环戊环化和随后的双重 [4 + 2] 苯并环化。1的结构已通过X射线晶体学明确证实;由于苯环和湾区氢取代基的空间位阻,图1采用了扭曲的几何形状。值得注意的是,化合物 1 表现出较窄的能隙 (1.78 eV) 和比没有五元环稠合的母体哌芘更低的 LUMO 能级。此外,通过理论计算评估了周边稠合五边形对1的芳香性和分子轨道的影响。这项工作提出了一种开发具有环戊基部分的π-扩展芳香烃的有效方法。