Synthesis of Indazolo[2,1-a]Cinnolines via Rhodium (III)-Catalyzed C–H activation/annulation under mild conditions
作者:Wei Hou、Huan Xiong、Ruisong Bai、Zaozao Xiao、Lin Su、Bengfang Helen Ruan、Hongtao Xu
DOI:10.1016/j.tet.2019.06.021
日期:2019.7
A simple, robust and efficient Rh(III)-catalyzed synthesis of novel 12H-indazolo[2,1-a]cinnolin-12-ones has been developed via tandem C–H activation/annulation of 2-phenylindazolones with diazo compounds by using less developed secondary amine as an intrinsic directing group. Notably, a series of nondiscriminating conditions were obtained with excellent test yield. Also, this reaction is highly regioselective
通过串联重活化2-苯基吲唑酮与重氮化合物的CH-H活化/环化反应,已开发出一种简单,可靠且有效的Rh(III)催化合成新型12H-吲唑并[2,1- a ] cinnolin -12-ones。较不发达的仲胺作为内在的指导基团。值得注意的是,以优异的测试产率获得了一系列非歧视条件。同样,该反应在区域范围很广的情况下具有很高的区域选择性,给电子基团和吸电子基团在非常温和的条件下(室温至40°C)都能获得令人满意的产率。它具有可扩展性,与空气和H 2 O兼容,唯一的副产物是N 2和H 2O.此外,合成产物代表一类新的荧光团,并且已经进行了它们的初始光谱表征。