Synthesis of 3-Substituted 2-Aminonaphtho[2,3-<i>b</i>]furan-4,9-diones from 2-Hydroxy-1,4-Naphthoquinone and Nitroalkenes
作者:Manoj R. Zanwar、Veerababurao Kavala、Sachin D. Gawande、Chun-Wei Kuo、Ting-Shen Kuo、Mei-Ling Chen、Chiu-Hui He、Ching-Fa Yao
DOI:10.1002/ejoc.201300996
日期:2013.12
The efficient base-catalyzed synthesis of 3-substituted2-aminonaphtho[2,3-b]furan-4,9-dione derivatives from readily available precursors such as 2-hydroxy-1,4-naphthoquinone and nitroalkenes under aqueous conditions is described. Interesting features of this methodology are the conversion of a nitro functionality into an amino functionality in the absence of a reducing agent and the development of
Novel palladium catalysed two- and three-component thermal (conventional heating and microwave) cascade processes are described involving allenylation of an aryl iodide to generate a (π-allyl)palladium species, which are intercepted (inter- or intramolecularly) by a carbon or nitrogen nucleophile followed by intramolecular Michael addition to afford carbo- and heterocycles in good yields.
Stabilization of Ethynyl‐Substituted Aryl‐λ
<sup>3</sup>
‐Iodanes by Tethered
<i>N</i>
‐Heterocylces**
作者:Thomas J. Kuczmera、Andreas Boelke、Boris J. Nachtsheim
DOI:10.1002/ejoc.202200276
日期:2022.6.13
A newclass of ethynyl N-heterocycle-substituted-λ3-iodanes (ENHIs) is presented. The (pseudo)cyclic iodanes were synthesized using a one-pot protocol with a variety of heterocycles and substituents and could be used for well-established alkynylation reactions with a comparable reactivity to TIPS-EBX. Moreover, an unexpected self-reactivity was found, which leads to a new alkynylation method and the
Iron-Catalyzed Oxidative C(3)–H Functionalization of Amines
作者:Noriaki Takasu、Kounosuke Oisaki、Motomu Kanai
DOI:10.1021/ol400568u
日期:2013.4.19
Fe-catalyzed direct dehydrogenative C(3)-functionalization of tertiary arylamines was developed via activation of the sp(3) C(3)-H bond. The reaction is applicable to both cyclic and acyclic amines. The key process is the catalytic desaturative enamine formation from tertiary amines and position-selective C-C bond formation (addition to nitro olefins) at the beta-carbon. Products can be converted to versatile and unique nitrogen-containing molecules.
Synthesis of carbo- and heterocycles via a palladium-catalysed allene insertion–nucleophile incorporation–Michael addition cascade
A novel palladium catalysed three-component cascade process is described involving allenylation of an aryl iodide to generate a (pi-allyl)palladium species which is intercepted by a carbon or nitrogen nucleophile followed by intramolecular Michael addition to afford carbo- and heterocycles in good yield. (C) 2003 Elsevier Ltd. All rights reserved.