Synthesis of C,N′-linked bis-heterocycles using a deprotometalation–iodination–N-arylation sequence and evaluation of their antiproliferative activity in melanoma cells
crude iodides were involved in the N-arylation of pyrrole, indole, carbazole, pyrazole, indazole, imidazole and benzimidazole in the presence of Cu (0.2 equiv) and Cs2CO3 (2 equiv), and using acetonitrile as solvent (no other ligand) to provide after 24 h reflux the expected N-arylated azoles in yields ranging from 33% to 81%. Using benzotriazole also led to N-arylation products, but in lower 34%, 39%
苯并噻吩,苯并呋喃,苯并噻唑和苯并恶唑是使用由ZnCl 2 ·TMEDA(TMEDA = N,N,N ',N'-四甲基乙二胺,1当量)和2,2,6,6-四甲基哌啶锂制备的锂-锌组合脱金属金属盐的。(LiTMP,3当量)。随后使用碘作为亲电试剂拦截2-金属化衍生物,碘化物的收率分别为81%,82%,67%和42%。与使用ZnCl 2获得的产率相比,这些产率更高(提高了10%)·TMEDA(0.5当量)和LiTMP(1.5当量),但苯并恶唑(少10%)的情况除外。在Cu(0.2当量)和Cs 2 CO 3存在下,粗碘化物参与吡咯,吲哚,咔唑,吡唑,吲唑,咪唑和苯并咪唑的N-芳基化反应(2当量),并使用乙腈作为溶剂(无其他配体),在回流24小时后提供预期的N-芳基化吡咯,产率为33%至81%。使用苯并三唑还可以产生N-芳基化产物,但产率分别较低,分别为34%,39%,36%和6%。对该唑的进一步研究证明了2
Nickel-Catalyzed C–N Cross-Coupling of Ammonia, (Hetero)anilines, and Indoles with Activated (Hetero)aryl Chlorides Enabled by Ligand Design
作者:Ryan T. McGuire、Julia F. J. Paffile、Yuqiao Zhou、Mark Stradiotto
DOI:10.1021/acscatal.9b03715
日期:2019.10.4
ancillary ligand Phen-DalPhos (L1) was employed in the cross-coupling of (hetero)anilines with (hetero)arylchlorides and in the diarylation of ammonia with (hetero)arylchlorides to afford heteroatom-dense di(hetero)arylamines. The PAd2-DalPhos precatalyst C4 provided complementary reactivity in cross-couplings of indoles with (hetero)arylchlorides. Taken together, the demonstration of room-temperature
6-diisopropylphenyl)acenaphthoimidazol-2-ylidene (AnIPr) with an achiral 2-naphthyl-4,4-dimethyloxazoline palladacyclic fragment. Applying this precatalyst enabled a general protocol for Pd-catalyzedC–Ncross-couplingreactions of challenging five- or six-membered ring heteroaryl chlorides and various heterocyclic amines. The desired aminated products, including commercial pharmaceuticals or key intermediates such
Green synthesis of CuO nanoflakes from copper pincer complex for effective N-arylation of benzimidazole
作者:P. Jerome、G. Kausalya、T. Daniel Thangadurai、R. Karvembu
DOI:10.1016/j.catcom.2015.11.018
日期:2016.2
Nanostructured CuO is synthesized in water using copper pincer complex as precursor without any stabilizing agent and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray analysis (EDAX). The selected area electron diffraction (SAED) and magnetization measurements indicate lattice fringes spacing of 0.25 nm for (111) plane and ferromagnetic nature of the CuO nanoflakes, respectively. Benzimidazole undergoes N-arylation reaction with aryl halides in the presence of CuO nanoflakes and K2CO3 in N,N-dimethylacetamide (DMAc) at 120 degrees C. The reusability of the CuO nanoflakes is also tested and the results are found to be good. (C) 2015 Elsevier B.V. All rights reserved.