Oxalyl Boronates Enable Modular Synthesis of Bioactive Imidazoles
作者:C. Frank Lee、Aleksandra Holownia、James M. Bennett、Jonathan M. Elkins、Jeffrey D. St. Denis、Shinya Adachi、Andrei K. Yudin
DOI:10.1002/anie.201611006
日期:2017.5.22
accessible through commercially available starting materials, enables a modular approach for the synthesis of imidazoles. A variety of aromatic, heteroaromatic, and alkyl carboxaldehydes were condensed with oxalyl boronates to afford substituted boryl imidazoles in a regiocontrolled fashion. Subsequent palladium-catalyzed cross-coupling with haloarenes furnished the desired trisubstituted imidazole scaffolds
Photocatalytic coupling of amines to imidazoles using a Mo–ZnIn<sub>2</sub>S<sub>4</sub> catalyst
作者:Min Wang、Lihua Li、Jianmin Lu、Nengchao Luo、Xiaochen Zhang、Feng Wang
DOI:10.1039/c7gc01728f
日期:——
we report a new route for the synthesis of substituted imidazoles via photocyclization of readily available amines at room temperature. The reaction is achieved by the visible-light-induced C–C/C–N bond coupling and subsequent dehydrogenation reaction over Mo–ZnIn2S4 as a heterogeneous photocatalyst. A wide range of amines were converted into the corresponding tri- and tetra-substituted imidazoles with
取代的咪唑传统上是通过多种原料的共缩合反应合成的。在这里,我们报告了一种新的途径,用于在室温下通过光环化现成的胺来合成取代的咪唑。该反应是通过可见光诱导的C–C / C–N键偶联以及随后作为非均相光催化剂的Mo–ZnIn 2 S 4进行的脱氢反应来实现的。多种胺被转化为相应的三取代和四取代的咪唑,总收率高达96%。该新反应的简单性,高效性和温和条件的优点将使其能够用于合成转化中。
Imidazole synthesis by transition metal free, base-mediated deaminative coupling of benzylamines and nitriles
作者:Uttam Kumar Das、Linda J. W. Shimon、David Milstein
DOI:10.1039/c7cc08322j
日期:——
A transition metal free, straightforward synthetic method for the preparation of substituted imidazoles is reported herein. Base promoted, deaminative coupling of benzylamines with nitriles results in the one-step synthesis of 2,4,5-trisubstituted imidazoles with liberation of ammonia. This protocol provides a practical strategy for the synthesis of valuable imidazole derivatives from readily available
C–H heteroarylation of aromatics <i>via</i> catalyst free S<sub>N</sub>2′ coupling cycloaromatization
作者:Qixing Lu、Tao Wang、Qian Wu、Lijing Cheng、Han Luo、Lei Liu、Guobiao Chu、Lufeng Wang、Baosheng Li
DOI:10.1039/d2gc00467d
日期:——
construction of a carbon–carbon bond is the most fundamental aspect of synthetic chemistry. In this study, we developed a catalyst-free SN2′ reaction of β-OTf-substituted enamides with aromatics to obtain aryl-substituted aza-1,4-dicarbonyl compounds that can be in situ transformed into aryl-imidazole, aryl-thiazole, and aryl-oxazole in one-pot operation, thus achieving C–Hheteroarylation of aromatics. This simple
碳-碳键的构建是合成化学最基本的方面。在这项研究中,我们开发了 β-OTf 取代的烯酰胺与芳烃的无催化剂 S N 2' 反应,以获得芳基取代的 aza-1,4-二羰基化合物,该化合物可以原位转化为芳基咪唑、芳基-噻唑和芳基恶唑在一锅操作中,从而实现芳烃的 C-H 杂芳基化。这种简单、高效、清洁和可扩展的策略提供了难以实现的联芳基产品,与具有不同复杂性的各种芳烃兼容。该方法可用于各种商业药物或功能材料的后期改性,并为构建联芳基化合物提供了一种正交方法。
Metal-Controlled Switchable Regioselective Synthesis of Substituted Imidazoles and Pyrroles <i>via</i> Ring Opening/Cyclocondensation with 2<i>H</i>-Azirines
作者:Fen Xu、Wen-Jing Zhu、Pei-Wen Wang、Jia Feng、Xin-Ru Chen、Xiao-Hong Han、Hao-Tian Yan
DOI:10.1021/acs.joc.3c00430
日期:2023.7.21
ring opening/heterocyclization associated with direct cleavage of C–N and C–C bonds under appropriate conditions, the formation of imidazoles is presented. Alternatively, the silver-catalyzed radical [3 + 2] cycloannulation of 2H-azirines and 1,3-dicarbonyl compounds provides highly functionalized pyrrole derivatives. Both aliphatic cyclic and acyclic diketones are tolerated with good regioselectivity