Water-promoted Dowex 50W catalyzed highly efficient green protocol for 2-arylbenzothiazole formation
作者:Chhanda Mukhopadhyay、Arup Datta
DOI:10.1002/jhet.9
日期:2009.1
aldehydes were allowed to react in one-pot operation to give 2-aryl-benzothiazoles in excellent yields in the presence of Dowex50W in water. Very high yields coupled with the ease of work-up procedure, formation of no side products, employment of “reusable” catalyst, and “green” synthesis in aqueous medium without maintaining anhydrous reaction conditions are the most important aspects of this methodology
Pentafluorophenylammonium triflate: A Mild, Efficient and Reusable Catalyst for the Synthesis of 2-Arylbenzothiazole and 2-Arylbenzothiazoline Derivatives in a Green Chemical Approach
作者:Arup Datta
DOI:10.13005/ojc/370112
日期:2021.2.28
simple and environmentally benign effective synthesis of 2-substituted benzothiazole and benzothiazoline derivatives are described in presence of PFPAT (pentafluorophenylammonium triflate) catalyst in water successfully. A series of benzothiazole derivative were synthesized by the reaction between 2-aminothiophenol and various aldehydes in good yields. Recyclability of the catalyst is observed for four
Low-valent Titanium Induced Simultaneous Reduction of Nitro Group and S-S Bond in Nitrodisulfides: A Novel Method For the Synthesis of Benzothiazoline, Benzothiazoles and 2,3-Dihydro- 1,5-benzothiazepines
作者:Weihui Zhong、Xiaoyuan Chen、Yongmin Zhang
DOI:10.1080/00397910008087072
日期:2000.12.1
Abstract The simultaneousreduction of nitrogroup and S-S bond in nitrodisulfides by TiCl4/Sm system leds to the active intermediates 2, which were “living” double-anions (nitride anions and sulfide anions) in situ. These new anion species reacted smoothly with aldehydes or ketones, acid chlorides or acid anhydrides and α,β-unsaturated ketones respectively to afford the desired benzothiazolines, benzothiazoles
摘要 TiCl4/Sm 系统同时还原硝基二硫化物中的硝基和 SS 键,产生活性中间体 2,即原位“活性”双阴离子(氮化物阴离子和硫化物阴离子)。这些新的阴离子物种分别与醛或酮、酰氯或酸酐和 α,β-不饱和酮顺利反应,在温和和中性条件下以良好的收率得到所需的苯并噻唑啉、苯并噻唑和 2,3-二氢-1,5-苯并噻嗪使适应。
Conversion of bis(o-nitrophenyl)disulfides to heterocycles containing sulfur and nitrogen by the action of samarium diiodide
作者:Weihui Zhong、Xiaoyuan Chen、Yongmin Zhang
DOI:10.1002/hc.1025
日期:——
Treatment of bis(o-nitrophenyl)disulfides 1 with SmI2 led to simultaneous reduction of nitro groups and reductive cleavage of S–S bonds as well as the formation of the active intermediates 2. The intermediates 2 reacted smoothly with aldehydes or ketones, acid chlorides or anhydrides, α-bromoketones, and α,β-unsaturated ketones at room temperature to afford the desired benzothiazolines 3, benzothiazoles
A biomass-derived N-doped porous carbon catalyst for the aerobic dehydrogenation of nitrogen heterocycles
作者:Jing-Jiang Liu、Fu-Hu Guo、Fu-Jun Cui、Ji-Hua Zhu、Xiao-Yu Liu、Arif Ullah、Xi-Cun Wang、Zheng-Jun Quan
DOI:10.1039/d1nj05411b
日期:——
superior catalytic performance in the aerobic dehydrogenation of various heterocyclic nitrogen compounds (49 examples, up to 96% yield), similar to that of C3N4 and GO. Characterization by TEM, BET and XPS accompanied by the EPR analysis revealed that the enhanced catalytic properties of NC came from its high activation ability for both O2 and heterocyclic nitrogen, attributed to the porous structure and
N 掺杂的多孔碳 (NC) 是由甘蔗渣合成的,甘蔗渣是一种可持续且广泛使用的生物质废物。优选的 NC 样品具有发达的多孔结构、类似石墨烯的表面形态和不同的 N 种类。更重要的是,多相碳催化剂在各种杂环氮化合物的有氧脱氢反应中表现出优异的催化性能(49个例子,产率高达96%),类似于C 3 N 4和GO。TEM、BET 和 XPS 表征以及 EPR 分析表明,NC 的增强催化性能来自其对 O 2和杂环氮的高活化能力,分别归因于多孔结构和吡啶 N (N-6) 物种.