作者:Sarah Fernandez、Maximilian A. Ganiek、Mariia Karpacheva、Fabian C. Hanusch、Stephan Reuter、Thomas Bein、Florian Auras、Paul Knochel
DOI:10.1021/acs.orglett.6b01373
日期:2016.7.1
Pyridonaphthyridines (triazaphenanthrenes) were prepared in 4 steps and in 13–52% overall yield using Negishi cross-couplings between iodopicolines and 2-chloro-pyridylzinc derivatives. After chlorination, Gabriel amination and spontaneous ring-closure, the final aromatization leading to the triazaphenanthrenes was achieved with chloranil. This heterocyclic scaffold underwent a nucleophilic addition
使用碘吡啶和 2-氯吡啶基锌衍生物之间的 Negishi 交叉偶联分 4 个步骤制备吡啶并萘啶(三氮杂菲),总产率为 13-52%。在氯化、Gabriel 胺化和自发闭环之后,最终的芳构化作用是用氯苯醌获得的三氮杂菲。该杂环支架在 6 位进行亲核加成,导致进一步功能化的吡啶并萘啶。通过稳态和时间分辨光谱研究了这些化学修饰对光学性质的影响。虽然噻吩取代的杂环表现出最广泛的吸收,但苯基和呋喃取代的化合物表现出更强的光致发光,达到 20% 以上的量子产率和几纳秒的寿命。