Palladium-catalyzed Selective Amination of Aryl(haloaryl)amines with 9<i>H</i>
-Carbazole Derivatives
作者:Yuhki Ohtsuka、Tetsuya Yamamoto、Takanori Miyazaki、Tetsu Yamakawa
DOI:10.1002/adsc.201701356
日期:2018.3.1
‐1,1’‐biaryls. Various 9‐(arylamino)aryl‐9H‐carbazoles could be synthesized from aryl(haloaryl)amines and 9H‐carbazole derivatives in high yields by the use of tBu‐XPhos. The amination of 4‐bromotoluene with a mixture of diphenylamine and 9H‐carbazole gave only 9‐o‐tolyl‐9H‐carbazole with tBu‐XPhos, while the use of PtBu3 or XPhos afforded the mixture of 9‐o‐tolyl‐9H‐carbazole and diphenyl(o‐tolyl)amine
研究了钯与9 H-咔唑衍生物的芳基(卤代芳基)胺的胺化反应。在使用Pd 2(dba)3 / P t Bu 3 / NaO t Bu催化剂与9 H-咔唑胺化(4-溴苯基)苯胺中,主要产物为9- [4-(苯基氨基)苯基] -9 H-咔唑,收率60%,其中(4-溴苯基)苯胺转化率> 99%,并伴随形成9- [4- [苯基[4- [苯基[4-(苯基氨基)苯基]氨基]苯基] -9 H观察到连续产生的副产物咔唑(产率为15%)。使用XPhos代替P t Bu 3时,以81%的收率提供所需的产品,并将连续的副产品抑制到7.7%。通过使用t Bu‐XPhos ,所需产品的收率达到98%。用其他2-二叔丁基或2-二(1-金刚烷基)膦基-1,1'-联芳基也获得了如此优异的所需产品收率。可以通过使用t Bu-XPhos从芳基(卤代芳基)胺和9 H-咔唑衍生物高产率合成各种9-(芳基氨基)芳基-9 H-咔唑。用二苯胺和9