Palladium-Catalyzed Domino Double<i>N</i>-Arylations (Inter- and Intramolecular) of 1,2-Diamino(hetero)arenes with<i>o</i>,<i>o′</i>-Dihalo(hetero)arenes for the Synthesis of Phenazines and Pyridoquinoxalines
作者:Joydev K. Laha、K. S. Satyanarayana Tummalapalli、Ankur Gupta
DOI:10.1002/ejoc.201301091
日期:2013.12
which include base-sensitive groups, were well tolerated under the optimized reaction conditions to afford phenazines in good to excellent yields. The protocol was extended to the synthesis of pyridoquinoxalines by employing either o-phenylenediamines and 2,3-dihalopyridines or 1,2-diaminopyridines and 1,2-dihaloarenes.
已经开发出用于合成吩嗪的多米诺反应,从 1,2-二氨基芳烃和 1,2-二卤代芳烃开始,通过钯催化的双 N-芳基化(分子间和分子内)进行,然后进行原位氧化。在优化的反应条件下,包括碱敏感基团在内的各种官能团都具有良好的耐受性,从而以良好到优异的产率提供吩嗪。该协议通过使用邻苯二胺和 2,3-二卤代吡啶或 1,2-二氨基吡啶和 1,2-二卤代芳烃,扩展到合成吡啶并喹喔啉。