Novel synthesis of benzofuran- and indol-2-yl-methanamine derivatives
摘要:
We report on a novel synthesis towards benzofuran-2-yl-methanamine and indol-2-yl-methanamine derivatives by using ortho-methoxy and ortho-nitro substituted phenylacetic acids as starting material, respectively. For each compound series, a key intermediate bearing the oxazole-4-carboxylic acid methylester moiety was produced. Refluxing the ortho-methoxy series in HBr/HAc produced the desired benzofuran-2-yl-methanamines. Accordingly, for the synthesis of indoles the nitro-group was first reduced and reaming these intermediates in HCl gave the corresponding indol-2-yl-methanamines. The method worked well with electron donating substituents. Limitations regarding electron withdrawing substituents are discussed. This straightforward synthetic procedure can be a useful approach to generate a variety of substituted benzofuran-2-yl-methanamine and indol-2-yl-methanamine compounds by starting from readily available phenylacetic acid derivatives. (C) 2014 Elsevier Ltd. All rights reserved.
A new type of phosphorus‐doped porousorganicpolymer (POP) has been readily synthesized through a Heck reaction, which could be used not only as a support but also a ligand for palladium nanoparticles. The dual‐functional material supported palladium nanocatalyst was used for the efficient and chemoselectivehydrogenation of varieties of nitroarenes and α,β‐unsaturated compounds, as well as for the
Base-mediated Reaction of Quaternary Ammonium Salts with Nitroarenes - Their Useful Functionalization via Vicarious Nucleophilic Substitution (VNS)
作者:Andrzej Jończyk、Anna Kowalkowska
DOI:10.1055/s-2002-23546
日期:——
Ammonium ylides generated from ammonium salt 1a-e with a base react with derivatives of 3-nitropyridine 2a-c and 2-nitrothiophene (3) to form products of vicarious nucleophilic substitution (VNS) 7, 8, or 9 respectively. The products of VNS 10, 11, or 12 are also produced from the corresponding ammonium salts, a base and 4-chloro-nitrobenzene (4), nitrobenzene (5), or 1-nitronaphthalene (6), respectively. In a few products, an exchange of alkoxy group 7c or substitution of chlorine by alkoxyl 8a,b occured.
Active and Recyclable Catalytic Synthesis of Indoles by Reductive Cyclization of 2-(2-Nitroaryl)acetonitriles in the Presence of Co–Rh Heterobimetallic Nanoparticles with Atmospheric Hydrogen under Mild Conditions
作者:Isaac Choi、Hyunho Chung、Jang Won Park、Young Keun Chung
DOI:10.1021/acs.orglett.6b02659
日期:2016.11.4
cobalt–rhodium heterobimetallic nanoparticle-catalyzed reductive cyclization of 2-(2-nitroaryl)acetonitriles to indoles has been achieved. The tandem reaction proceeds without any additives under the mild conditions (1 atm H2 and 25 °C). This procedure could be scaled up to the gram scale. The catalytic system is significantly stable under these reaction conditions and could be reused more than ten times without
钴-铑异双金属纳米粒子催化的2-(2-硝基芳基)乙腈还原环化成吲哚。在温和条件下(1 atm H 2和25°C),串联反应在没有任何添加剂的情况下进行。该过程可以按比例放大至克级。在这些反应条件下,催化体系非常稳定,可以重复使用十次以上,而不会损失催化活性。
Synthesis of Substituted 3-Cyano- and 3-(Arenesulfonyl)indoles from o-Nitrobenzyl Cyanides and Sulfones
作者:Krzysztof Wojciechowski、Zbigniew Wróbel
DOI:10.1055/s-0030-1289515
日期:2011.10
enamines, in the reaction of o-nitrophenylacetonitriles with Vilsmeier reagents, followed by reductive cyclization using Zn in acetic acid, leads to variously substituted 3-cyanoindoles, possessing aryl, alkyl, and aminoalkyl substituents at C-2. The method, when starting from the appropriate o-nitrobenzylsulfones, allows the synthesis of substituted 3-(arenesulfonyl)-indoles. indoles - amides - cyclization