Efficient synthesis of 2-arylindoles, 2-arylimidazo[1,2-a]pyridines and 2-arylquinoxalines, and their bis-derivatives using [Hmim]OTf ionic liquid supported on nano-silica as a reusable catalyst
作者:Mohammad Soltani、Iraj Mohammadpoor-Baltork、Ahmad R. Khosropour、Majid Moghadam、Shahram Tangestaninejad、Valiollah Mirkhani
DOI:10.1007/s13738-015-0603-2
日期:2015.8
AbstractAn efficient and facile method for the synthesis of 2-arylindoles, 2-arylimidazo[1,2-a]pyridines and 2-arylquinoxalines by the reaction of variousα-bromoketones with anilines, 2-aminopyridine and 1,2-phenylenediamine, respectively, in the presence of N-methylimidazolium trifluoromethanesulfonate ionic liquid supported on nano-silica ([Hmim]OTf@nano-SiO2) as a reusable catalyst under solvent-free
摘要通过各种α-溴代酮与苯胺,2-氨基吡啶和1,2-苯二胺的反应,合成2-芳基吲哚,2-芳基咪唑并[1,2- a ]吡啶和2-芳基喹喔啉的一种高效简便的方法,分别在无溶剂条件下,在可重复使用的催化剂上,负载在纳米二氧化硅上的N-甲基咪唑三氟甲磺酸盐离子液体([Hmim] OTf @ nano-SiO 2)存在。这些化合物的双衍生物也首次使用该催化体系得到了有效的制备。所有产物均以高收率和短反应时间获得。 图形概要
Palladium‐Catalyzed C2−H Arylation of Unprotected (N−H)‐Indoles “On Water” Using Primary Diamantyl Phosphine Oxides as a Class of Primary Phosphine Oxide Ligands
作者:Oana Moncea、Didier Poinsot、Andrey A. Fokin、Peter R. Schreiner、Jean‐Cyrille Hierso
DOI:10.1002/cctc.201800187
日期:2018.7.9
We present the Pd‐catalyzedarylation of (N−H)‐indoles with functionalized haloarenes “on water” using hitherto untested primary diamantyl phosphine oxides (PPO) as ligands. Remarkable C2−H arylation selectivity was achieved by employing functionalized iodoarenes and N‐unprotected indoles. We provide evidence that the in situ generated oxide of (9‐hydroxydiamant‐4‐yl)phosphine L1 is key for the reaction
Methods for the synthesis of an indole in provided. Methods comprise oxidizing a N-aryl imine in the presence of a palladium-based catalyst, an oxidant, and a solvent.
Phosphine-Free Palladium-Catalyzed C−H Bond Arylation of Free (N−H)-Indoles and Pyrroles
作者:Xiang Wang、Denis V. Gribkov、Dalibor Sames
DOI:10.1021/jo061979v
日期:2007.2.1
This paper describes a phosphine-free palladium-catalyzed method for direct C-arylation of free (N-H)-indoles and pyrroles with iodo- and bromoarene donors. Employing commercially available materials, this new and operationally simple procedure provides a rapid entry to a wide range of C-arylated (N-H)-indoles including derivatives of tryptamine. In the course of this study, a profound halide effect was uncovered, affecting both the efficiency and regioselectivity of indole arylation.