Catalyst-free visible-light-induced condensation to synthesize bis(indolyl)methanes and biological activity evaluation of them as potent human carboxylesterase 2 inhibitors
作者:Yi-Shu Zhao、Hong-Li Ruan、Xiu-Yang Wang、Chen Chen、Pei-Fang Song、Cheng-Wei Lü、Li-Wei Zou
DOI:10.1039/c9ra08593a
日期:——
A mild strategy for visible-light-induced synthesis of bis(indolyl)methanes was developed using aromatic aldehydes and indole as substrates. This reaction could be performed at room temperature under catalyst- and additive-free conditions to synthesize a series of bis(indolyl)methanes in good to excellent yields. In addition, all synthesized bis(indolyl)methanes together with β-substituted indole derivatives
Intramolecular Pd-catalyzed C–H functionalization: construction of fused tetracyclic bis-indole alkaloid analogues
作者:Xue-Qiang Chu、You Zi、Xin-Mou Lu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1016/j.tet.2013.11.079
日期:2014.1
An efficient Pd-catalyzed intramolecular indole-C2-arylation protocol for the synthesis of pharmaceutically active bis-indole alkaloid analogues from simple and readily available and 3,3'-Bis(1H-indo1-3-y1) methanes derivatives has been developed. The corresponding products could be obtained in moderate to excellent yields, which permits selective modification on either one of the two indole moieties independently. (C) 2013 Elsevier Ltd. All rights reserved.
Tetramethyl guanidinium chlorosulfonate as a highly efficient and recyclable organocatalyst for the preparation of bis(indolyl)methane derivatives
作者:Reddi Mohan Naidu Kalla、Johnson V. John、Huiju Park、Il Kim
DOI:10.1016/j.catcom.2014.08.003
日期:2014.12
The synthesis and characterization of a novel superbase ionic liquid, tetramethylguanidinium chlorosulfonate, are described. The guanidine ionic liquid (GIL) was characterized by FT-IR and NMR spectroscopies, and wide-angle X-ray scattering techniques, as well as thermogravimetric analysis. The GIL functions as an effective, environmentally benign, and recyclable catalyst for the synthesis of various bis(indolyl)methanes in outstanding yields (90-96%), within short reaction times; further, no chromatographic purification step for the product is required. (C) 2014 Elsevier B.V. All rights reserved.
Synthesis of Furans and Pyrroles from 2-Alkoxy-2,3-dihydrofurans Through a Nucleophilic Substitution-Triggered Heteroaromatization
An effective method to synthesize α‐functionalized furan and pyrrole derivatives was developed using 2‐alkoxy‐2,3‐dihydrofurans as modular precursors. This protocol featured a previously unreported tandem nucleophilic substitution/heteroaromatization reaction. Nucleophiles such as indole, α‐oxoketene dithioacetal, trimethoxybenzene, and dimethoxynaphthalene can react readily with 2‐alkoxy‐2,3‐dihydrofurans
Friedel–Crafts Alkylation of Indoles with Aldehydes/Ketones Catalyzed by Bromodiarylethene-Based Photoacid Generators
作者:Valerii Z. Shirinian、Alexey V. Zakharov、Sofia M. Timofeeva
DOI:10.1055/a-2270-3973
日期:——
Diarylethenes (DAEs) with a bromine atom at the ring-closing position catalyze C–C bonding reactions induced by UV or sunlight. Upon photo-irradiation, bromodiarylethenes undergo 6π-electrocyclization (6π-EC), followed by the release of an acid species that catalyzes the double Friedel–Crafts addition of indoles to aldehydes and isatins to form the corresponding triarylmethanes and 3,3′-diarylindolin-2-ones