Iron fluoride: the most efficient catalyst for one-pot synthesis of 4H-pyrimido[2,1-b]benzothiazoles under solvent-free conditions
作者:Amol B. Atar、Yong Seok Jeong、Yeon Tae Jeong
DOI:10.1016/j.tet.2014.05.094
日期:2014.8
A new iron fluoride assisted convenient and efficient strategy for the preparation of 4H-pyrimido[2,1-b]benzothiazolesderivatives in solvent-free media is described. The reactions can be performed at low-catalyst loadings with excellent functional group tolerance. The catalyst can be readily recovered and reused for next reaction for at least three runs without any significant impact on the yields
描述了一种在无溶剂介质中制备4 H-嘧啶并[2,1- b ]苯并噻唑衍生物的新型氟化铁辅助方便高效策略。该反应可以在低催化剂负载下以优异的官能团耐受性进行。催化剂可以容易地回收并再用于至少三轮反应的下一步反应,而对产物的收率没有任何明显的影响。易于回收的催化剂和高收率的产品使该方案具有吸引力,可持续性和经济性。
Facile and Efficient Synthesis of Tetrahydrobenzimidazo [2,1-<i>b</i>]Quinazolin-1(2<i>H</i>)-One Derivatives Using Brönsted Acidic Ionic Liquid Immobilized on Nanoporous Na<sup>+</sup>-Montmorillonite
In this work, an efficient and green procedure have been described for the synthesis of tetrahydrobenzimidazo[2,1-b]quinazolin-1(2H)-one derivatives using nanoporous sodium montmorillonite clay (Na+-MMT) modified with 1-methyl-3-(trimethoxysilylpropyl)-imidazolium hydrogen sulfate (Na+-MMT-[pmim]HSO4). The procedure gave the products in excellent yields in very short reaction times under solvent-free
Synthesis of Benzimidazolo[2,3-<i>b</i>]quinazolinone Derivatives via a One-pot Multicomponent Reaction Promoted by a Chitosan-based Composite Magnetic Nanocatalyst
作者:Ali Maleki、Morteza Aghaei、Nakisa Ghamari
DOI:10.1246/cl.141074
日期:2015.3.5
A practical and green approach for the one-pot multicomponent synthesis of tetraheterocyclic benzimidazolo[2,3-b]quinazolinones has been described via the condensation of 2-aminobenzimidazole or 2-aminobenzothiazole, dimedone, and various aldehydes using Fe3O4@chitosan as an environmentally benign and reusable nanocomposite catalyst in good to excellent yields.
protocol has many fascinating features, viz. high product yields, eco-friendly, milder reaction conditions, avoiding the use of hazardous solvent, and easily recoverable and reusable catalyst. The good functional group tolerance with a series of derivatives has been demonstrated. Molecular docking studies were performed on the synthesized compounds using Staphylococcus aureus dihydropteroate synthase (saDHPS)
Amberlyst-15® in PEG: A novel catalytic system for the facile and efficient one-pot synthesis of benzothiazolo-[2,3-b]-quinazolinone derivatives
作者:Kidwai Mazaahir、Chauhan Ritika、Bhatnagar Divya
DOI:10.1007/s11426-012-4665-z
日期:2012.10
A simple and convenient approach for the synthesis of tetraheterocyclic benzothiazolo-[2,3-b]-quinazolin-1-ones has been developed utilizing the MCR methodology, which involves the condensation of 2-aminobenzothiazole, cyclic β-diketones and various aldehydes using Amberlyst-15® in PEG 400 as an environmentally benign and reusable catalyst system. Environmental benignity, recyclability, cost-effectiveness
利用MCR方法开发了一种简单方便的合成四杂环苯并噻唑-[2,3 - b ]-喹唑啉-1-酮的方法,该方法涉及2-氨基苯并噻唑,环状β-二酮和各种醛的缩合反应。的Amberlyst-15 ®在PEG 400作为环境友好和可重复使用的催化剂体系。环境友好,可回收利用,成本效益,易于加工和优异的收率是这一一锅法的主要特点。