A General, Efficient, and Functional-Group-Tolerant Catalyst System for the Palladium-Catalyzed Thioetherification of Aryl Bromides and Iodides
作者:Manuel A. Fernández-Rodríguez、John F. Hartwig
DOI:10.1021/jo802594d
日期:2009.2.20
reaction of aryl bromides and iodides with aliphatic and aromatic thiols catalyzed by palladium complexes of the bisphosphine ligand CyPF-tBu (1) is reported. Reactions occur in excellent yields, broad scope, high tolerance of functional groups, and with turnover numbers that exceed those of previous catalysts by 2 or 3 orders of magnitude. These couplings of bromo- and iodoarenes are more efficient than
报道了由双膦配体 CyPF- t Bu ( 1 )的钯配合物催化的芳基溴化物和碘化物与脂肪族和芳香族硫醇的交叉偶联反应。反应以优异的产率、广泛的范围、高的官能团耐受性以及比以前催化剂高出 2 或 3 个数量级的周转数发生。这些溴代芳烃和碘代芳烃的偶联比氯芳烃的相应反应更有效,并且可以在较少的催化剂负载和/或更温和的反应条件下进行。因此,以前在芳基氯偶联中报道的范围和官能团耐受性的限制现在得到了克服。
QUINOLINE DERIVATIVES FOR MODULATING DNA METHYLATION
申请人:Phiasivongsa Pasit
公开号:US20110256092A1
公开(公告)日:2011-10-20
Quinoline derivatives, particularly 4-anilinoquinoline derivatives, are provided. Such quinoline derivatives can be used for modulation of DNA methylation, such as effective inhibition of methylation of cytosine at the C-5 position, for example via selective inhibition of DNA methyltransferase DNMT1. Methods for synthesizing numerous 4-anilinoquinoline derivatives and for modulating DNA methylation are provided. Also provided are methods for formulating and administering these compounds or compositions to treat conditions such as cancer and hematological disorders.
A series of 4-substituted phenylguanidinium derivatives was synthesized and its antimicrobial activity was evaluated in vitro against eight potentially pathogenic strains of fungi.
One-Pot Synthesis of Amine-Substituted Aryl Sulfides and Benzo[<i>b</i>]thiophene Derivatives
作者:Zhongyu Duan、Sadananda Ranjit、Xiaogang Liu
DOI:10.1021/ol100816g
日期:2010.5.21
A series of amine-substituted aryl sulfides have been synthesized from nitroaryl halides via a simple one-pot procedure involving metal-free C S cross-coupling and in situ nitro group reduction. Various nitroaryl halides were reacted with thiols in recyclable poly(ethylene glycol) to afford the amine-substituted aryl sulfides in high yield. Additionally, the cross-coupling reactions of nitro- and aldehyde-substituted aryl halides with benzyl thiols under the same reaction conditions were demonstrated to afford benzothiazole and phenylbenzo[b]thiophene derivatives.
A general rhodium-catalyzed cross-coupling reaction of thiols with aryl iodides
作者:Chih-Shin Lai、Hsin-Lun Kao、Yan-Jhang Wang、Chin-Fa Lee
DOI:10.1016/j.tetlet.2012.06.054
日期:2012.8
The general procedure for the rhodium-catalyzed cross-coupling of thiols with aryl iodides is described. The catalytic system consists of 5 mol % of [RhCl(cod)](2) and 10 mol % of PPh3 as a ligand. A variety of aryl iodides reacted with thiols, giving aryl thioethers in good to excellent yields. It is important to note that the deactivated aryl iodides such as 4-iodoanisole is worked smoothly to provide the corresponding aryl thioethers in excellent yields. Functional groups such as free-amines, chloro, are all tolerated under the employed reaction conditions. (C) 2012 Elsevier Ltd. All rights reserved.