Cross-coupling study of iodo/chloropyridines and 2-chloroquinoline with atom-economic triarylbismuth reagents under Pd-catalysis
摘要:
This study describes the palladium-catalyzed couplings of iodopyridines, chloropyridines, and chloroquinoline with atom-economic BiAr3 reagents in sub-stoichiometric loadings. Mono-arylations of iodo and chloropyridines produced arylpyridines in high yields. The couplings addressed with dihalopyridines have afforded chemo- and regio-selective coupling products. Arylations of 2-chloroquinoline with different triarylbismuth reagents demonstrated fruitful coupling reactivity under the established conditions. This sumptuous study demonstrates the remarkable cross-coupling reactivity of iodo/chloropyridines and chloroquinoline with triarylbismuth reagents. (C) 2014 Elsevier Ltd. All rights reserved.
Some regioselective cross-coupling reactions of halopyridines and halopyrimidines
作者:Nadja M. Simkovsky、Monika Ermann、Stanley M. Roberts、David M. Parry、Andy D. Baxter
DOI:10.1039/b205027g
日期:2002.8.8
An efficient procedure for cross-coupling of 3-bromopyridine and 4-bromoanisole to various mono- and dichloro heteroaryl compounds—giving the corresponding biaryls in 74–96% yield—is described.
Hiyama Cross-Coupling of Chloro-, Fluoro-, and Methoxypyridyltrimethylsilanes: Room-Temperature Novel Access to Functional Bi(het)aryl
作者:Philippe Pierrat、Philippe Gros、Yves Fort
DOI:10.1021/ol047482u
日期:2005.2.1
pyridyltrimethylsilanes allowed us to perform efficient Hiyama cross-coupling with various (het)arylhalides. The reactions proceeded smoothly at room temperature leading to the corresponding functional bis(het)aryl in fair to excellent yields. The presence of pyridine nitrogen alpha to the trimethylsilyl group was requisite to achieve the cross-coupling. [Reaction: see text]
solvent, an array of xanthenes, thiazole, pyrazine, and pyridazine are compatible with this new arylation approach. The broad substrate scope, mild reaction conditions, and use of water as reaction solvent make this procedure a practical and environmentally friendly method for the synthesis of compounds containing aryl‐heteroaryl motifs.
已经开发出一种高效的可见光促进的N-杂芳烃与芳基重氮盐在水中的“自由基型”偶联。在室温下将反应继续进行的[Ru(联吡啶)3 ]氯2 ⋅ 6 H 2O作为光敏剂,商用灯泡作为光源。在这些反应条件下,吡啶和各种取代的吡啶是有效的底物,仅形成具有不同区域选择性的单取代产物。使用甲酸水溶液作为溶剂,一系列的黄嘌呤,噻唑,吡嗪和哒嗪与这种新的芳基化方法兼容。广泛的底物范围,温和的反应条件以及使用水作为反应溶剂,使得该程序成为合成具有芳基-杂芳基基序的化合物的实用且环境友好的方法。
Continuous Flow Magnesiation of Functionalized Heterocycles and Acrylates with TMPMgCl⋅LiCl
作者:Trine P. Petersen、Matthias R. Becker、Paul Knochel
DOI:10.1002/anie.201404221
日期:2014.7.21
A flow procedure for the metalation of functionalizedheterocycles (pyridines, pyrimidines, thiophenes, and thiazoles) and various acrylates using the strong, non‐nucleophilic base TMPMgCl⋅LiCl is reported. The flow conditions allow the magnesiations to be performed under more convenient conditions than the comparable batch reactions, which often require cryogenic temperatures and long reaction times
A General Strategy for N-(Hetero)arylpiperidine Synthesis Using Zincke Imine Intermediates
作者:Jake D. Selingo、Jacob W. Greenwood、Mary Katherine Andrews、Chirag Patel、Andrew J. Neel、Barbara Pio、Michael Shevlin、Eric M. Phillips、Matthew L. Maddess、Andrew McNally
DOI:10.1021/jacs.3c11504
日期:2024.1.10
compounds. Here, we present a general strategy to access N-(hetero)arylpiperidines using a pyridine ring-opening and ring-closing approach via Zincke imine intermediates. This process generates pyridiniumsaltsfrom a wide variety of substituted pyridines and (heteroaryl)anilines; hydrogenationreactions and nucleophilic additions then access the N-(hetero)arylpiperidine derivatives. We successfully applied