Two successive carbon–carbon bond-forming annulation of indoles with ethyl (2-ethynylaryl)methyl carbonates and their heteroaryl analogs under indium catalysis provided aryl- and heteroaryl[b]carbazoles, photoluminescent properties of which were then evaluated and compared with those of the corresponding [a]- and [c]-types, thereby showing that the order of light-emitting efficiency is [a]- < [b]- < [c]-type.
在
铟催化下,
吲哚与乙基(2-
乙炔基芳基)甲基
碳酸酯及其杂芳基类似物进行两次连续的碳-碳键成环反应,得到了具有光致发光性能的芳基和杂芳基咔唑类化合物。随后评估并比较了这些化合物的光致发光性能与相应[a]-和[c]-型化合物,结果显示发光效率的顺序为[a]- < [b]- < [c]-型。