Oxidant/Solvent-Controlled I<sub>2</sub>-Catalyzed Domino Annulation for Selective Synthesis of 2-Aroylbenzothiazoles and 2-Arylbenzothiazoles under Metal-Free Conditions
作者:Renchao Ma、Yuxin Ding、Rener Chen、Zhiming Wang、Lei Wang、Yongmin Ma
DOI:10.1021/acs.joc.0c02095
日期:2021.1.1
A simple and practical domino protocol for the selective synthesis of 2-aroylbenzothiazoles and 2-aryl benzothiazoles catalyzed by I2 is developed under metal-free conditions. The reaction outcomes are exclusively controlled by the reaction oxidant/medium. With DMSO employed as both the solvent and the oxidant, an oxidation of aromatic methyl ketones takes precedence over the condensation with 2-aminobenzenethiols
rearrangement of acyl-anion equivalents generated by N-heterocyclic carbene (NHC) catalysis has been achieved. The developed method includes CAr−O, CAr−S, or CAr−N bondcleavage for the formation of a CAr−C bond and enables access to 2-hydroxybenzophenones, an important structural motif that is present in several bioactive natural products. By utilizing this procedure, the alkaloid taxilamine was synthesized
N杂环卡宾(NHC)催化产生的酰基阴离子当量的Truce-Smiles重排已实现。所开发的方法包括裂解C Ar -O,C Ar -S或C Ar -N键以形成C Ar -C键,并能够获得2-羟基二苯甲酮,这是几种生物活性天然存在的重要结构基序产品。通过使用该程序,生物碱紫杉胺分三步合成。DFT计算和控制实验支持经典S NAr机理是与催化剂结合的Meisenheimer型中间体。该方法具有温和的反应条件,出色的官能团耐受性和广泛的底物范围,包括各种类别的(杂)芳烃。
New synthesis of 2-aroylbenzothiazoles <i>via</i> metal-free domino transformations of anilines, acetophenones, and elemental sulfur
作者:Tien V. Huynh、Khang V. Doan、Ngoc T. K. Luong、Duyen T. P. Nguyen、Son H. Doan、Tung T. Nguyen、Nam T. S. Phan
DOI:10.1039/d0ra01750g
日期:——
A new synthesis of 2-aroylbenzothiazoles via iodine-promoted domino transformations of anilines, acetophenones, and elemental sulfur was demonstrated. The highlights of this tandem synthesis are (1) easily available anilines and acetophenones as feedstock; (2) transition metal-free conditions; (3) inexpensive, nontoxic, easy handling, and abundant elemental sulfur as a building block. This synthetic
Homolytic acylation of benzothiazole. A diagnostic criterion for the presence of acyl radicals
作者:T. Caronna、R. Galli、V. Malatesta、F. Minisci
DOI:10.1039/j39710001747
日期:——
Benzothiazole is acylated by acylradicals obtained from aldehydes selectively in the 2-position. The nucleophilic character of acylradicals is also confirmed by the higher reactivity of the 6-nitro-derivative. The high reactivity is useful in syntheses; this reaction can also be used as a diagnosticcriterion for revealing the presence of acylradicals in the oxidation of aldehydes with various oxidizing
The present invention is directed to compounds of Formulae (I), (IIa-IIh), (IIIa-IIIe), (IVa-IVc), (Va-V1), (VIa-VII), (VII), (VIII) and (IX), pharmaceutical compositions thereof and methods of use thereof in the treatment of conditions associated with a dysfunction in proteostasis.