Synthesis of indoles through Rh(III)-catalyzed C–H cross-coupling with allyl carbonates
摘要:
A practical Rh-catalyzed reaction was developed to achieve 2-alkyl-substituted indole synthesis. The reaction can tolerate a variety of synthetically important functional groups. The indole products can also be transformed into other important skeletons. Two bioactive compounds, that is indomethacin and pravadoline were prepared using the new method. (C) 2014 Published by Elsevier Ltd.
Palladium(II)-Catalyzed Direct Conversion of Methyl Arenes into Aromatic Nitriles
作者:Zhibin Shu、Yuxuan Ye、Yifan Deng、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201305731
日期:2013.9.27
From methyl to nitrile: A mild ammoxidation method, which directly converts methyl arenes into aromatic nitriles, has been developed by using Pd(OAc)2 and N‐hydroxyphthalimide (NHPI) as the catalysts, and tert‐butyl nitrite as the nitrogen source and oxidant.
Metal-Free C–O Bond Functionalization: Catalytic Intramolecular and Intermolecular Benzylation of Arenes
作者:Luis Bering、Kirujan Jeyakumar、Andrey P. Antonchick
DOI:10.1021/acs.orglett.8b01495
日期:2018.7.6
conditions enabled a catalytic and metal-free Friedel–Craftsalkylation reaction with benzylic alcohols, producing water as the stoichiometric byproduct. A comprehensive scope (>50 examples) for both approaches and application in drug synthesis were demonstrated. Mechanistic studies suggest a Lewis acid-based mechanism for the metal-free Friedel–Crafts reaction.
Iron-Catalyzed <i>Ortho</i> C–H Methylation of Aromatics Bearing a Simple Carbonyl Group with Methylaluminum and Tridentate Phosphine Ligand
作者:Rui Shang、Laurean Ilies、Eiichi Nakamura
DOI:10.1021/jacs.6b06908
日期:2016.8.17
(Me2N-TP), that allows us to convert an ortho C-H bond to a C-CH3 bond in aromatics and heteroaromatics bearing simple carbonyl groups under mild oxidative conditions. The reaction is powerful enough to methylate all four ortho C-H bonds in benzophenone. The reaction tolerates a variety of functionalgroups, such as boronic ester, halide, sulfide, heterocycles, and enolizable ketones.
A readily accessible and bench-stable water-soluble hypervalent iodine(III) reagent (phenyliodonio)sulfamate (PISA) with an I–N bond was synthesized, and its structure was characterized by X-ray crystallography. With PISA, various indoles were synthesized via C–H amination of 2-alkenylanilines involving an aryl migration/intramolecular cyclization cascade with excellent regioselectivity in aqueous
The selective synthesis of C-2/C-3 aminated five-membered heteroarenes incorporated various functionalities with aniline derivatives in a sustainable way remains an unmet challenge. This protocol presents a practical protocol for the C–H amination of heteroarenes via an electro-oxidative crosscoupling process. This electrosynthetic approach enables a facile access to a wide variety of synthetically
以可持续的方式选择性合成将各种功能与苯胺衍生物结合的 C-2/C-3 胺化五元杂芳烃仍然是一个未解决的挑战。该协议提出了一种通过电氧化交叉耦合过程对杂芳烃进行 C-H 胺化的实用协议。这种电合成方法可以轻松获得各种合成有用的杂芳烃衍生物,耐受范围广泛的官能团,并且适合克级合成。此外,初步的机理研究表明,该胺化反应可能涉及 N 中心自由基和吲哚自由基阳离子之间的自由基交叉偶联过程。