the synthesis of aza-fused polycyclic quinolines (e.g., benzimidazo[1,2-a]quinolines) is described. This protocol includes an intermolecular condensation followed by a copper-catalyzed intramolecular C−N coupling reaction. The method is applied to a wide range of 2-iodo, 2-bromo, and 2-chloro aryl aldehyde substrates to yield the aza-fused polycyclic quinolines in good yields.
描述了一种合成氮杂稠合多环喹啉(例如,苯并咪唑并[1,2- a ]喹啉)的新的有效方法。该方案包括分子间缩合,然后进行铜催化的分子内CN偶联反应。该方法适用于广泛的2-碘,2-溴和2-氯芳基醛底物,从而以良好的收率生产出氮杂稠合的多环喹啉。
作者:David C. Young、Mariusz Tasior、Adèle D. Laurent、Łukasz Dobrzycki、Michał K. Cyrański、Nikolai Tkachenko、Denis Jacquemin、Daniel T. Gryko
DOI:10.1039/d0tc01202e
日期:——
substituent and/or the electron donating power of the other aryl substituent can further redshift both absorption and emission to reach ∼650 nm for the free-base and ca. 700 nm for boron-chelates. A strong intramolecular hydrogen bond is responsible for the small change in geometry between the ground and excitedstates and hence relatively small differences in photophysical properties upon formation of boron-chelates