A Novel One-Pot Synthesis of <i>N</i>-Acylindoles from Primary Aromatic Amides
作者:Béla Török、Mohammed Abid、Omar De Paolis
DOI:10.1055/s-2007-1000875
日期:2008.2
A novel one-pot synthesis of N-acylindoles via tandem cycloalkylation-annelation is described. This approach is based on the use of a strong solid-acid catalyst, montmorillonite K-10, and microwave irradiation under solvent-free conditions. The tandem cycloalkylation of amides and annelation of intermediate pyrroles were completed in minutes and provided good yields with high selectivities for the
DMAPO/Boc
<sub>2</sub>
O‐Mediated One‐Pot Direct
<i>N</i>
‐Acylation of Less Nucleophilic
<i>N</i>
‐Heterocycles with Carboxylic Acids
作者:Atsushi Umehara、Soma Shimizu、Makoto Sasaki
DOI:10.1002/cctc.202201596
日期:2023.3.8
Nitrogen Nucleophiles: A general method for direct N-acylation of less nucleophilic nitrogen heterocycles with carboxylic acids is reported. The method, which uses simple, commercially available reagents, no metals and user-friendly conditions, shows excellent functional group tolerance and broad substrate scope for both nitrogen nucleophiles and carboxylic acids.
2-(2-Aminophenyl)-acetaldehyde Dimethyl Acetal: A Novel Reagent for the Protection of Carboxylic Acids.
作者:Eri Arai、Hidetoshi Tokuyama、Martin S Linsell、Tohru Fukuyama
DOI:10.1016/s0040-4039(97)10491-9
日期:1998.1
The synthesis and use of 2-(2-aminophenyl)-acetaldehyde dimethyl acetal 1 are described. The amides 2, derived from this amine and carboxylic acids, are stable under basic conditions and thus can be regarded as the protected carboxylic acids. The corresponding carboxylic acids are regenerated by conversion of 2 into indolylamides 3 by treatment with CSA and subsequent hydrolysis with LiOOH or NaOH. In addition, 3 can be easily converted to esters, amides, and aldehydes. (C) 1997 Elsevier Science Ltd. All rights reserved.
Ir(I)-Catalyzed C–H Bond Alkylation of C2-Position of Indole with Alkenes: Selective Synthesis of Linear or Branched 2-Alkylindoles
作者:Shiguang Pan、Naoto Ryu、Takanori Shibata
DOI:10.1021/ja308742x
日期:2012.10.24
A cationic iridium-catalyzed C2-alkylation of N-substituted indole derivatives with various alkenes has been developed, which selectively gives linear or branched 2-alkylindoles in high to excellent selectivity. This protocol relies on the use of the carbonyl group on the nitrogen atom of indole as a directing group: a linear product was predominant when an acetyl group was used as a directing group, and a branched product was predominant with a benzoyl group.
Oxidation of 1-Benzoylpyrrole and 1-Aroylindoles by Palladium Acetate