已开发出一种有效的方法,可分两步合成1,8-二氧-八氢氧杂蒽。第一步,在溴化钠作为电解质存在的情况下,电生成的碱(EGB)催化二分体和芳族醛在一个未分隔的电池中的多组分转化为2,2'-芳基亚甲基双(3-羟基-5,5-二甲基) -2-环己烯-1-一)在室温下。第二步,使用H 2 SO 4作为脱水剂进行环化反应,得到对称的杂环1,8-二氧代-八氢氧杂蒽衍生物。反应时间短,后处理方便,使用廉价的试剂,简单的设备,新颖且环保的方法使该策略对制备x吨衍生物更为有用。
已开发出一种有效的方法,可分两步合成1,8-二氧-八氢氧杂蒽。第一步,在溴化钠作为电解质存在的情况下,电生成的碱(EGB)催化二分体和芳族醛在一个未分隔的电池中的多组分转化为2,2'-芳基亚甲基双(3-羟基-5,5-二甲基) -2-环己烯-1-一)在室温下。第二步,使用H 2 SO 4作为脱水剂进行环化反应,得到对称的杂环1,8-二氧代-八氢氧杂蒽衍生物。反应时间短,后处理方便,使用廉价的试剂,简单的设备,新颖且环保的方法使该策略对制备x吨衍生物更为有用。
Enhanced catalytic activity of bio-fabricated ZnO NPs prepared by ultrasound-assisted route for the synthesis of tetraketone and benzylidenemalonitrile in hydrotropic aqueous medium
作者:Suraj R. Attar、Bipin Shinde、Santosh B. Kamble
DOI:10.1007/s11164-020-04233-5
日期:2020.10
co-precipitation method in aqueousmedium. Different morphological forms of ZnO NPs were characterized by XRD, TGA, FESEM, EDX, FTIR, UV–Vis and BET. Neem (Azadirachta indica) leaf extract and ultrasoundirradiation have a crucial role in the formation of different morphologies of ZnO NPs. ZnO NPs synthesized from plant extract and hydrotrope show a synergistic effect that leads to efficientsynthesis of benzylidenemalonitrile
DMSO or aq HBr (10 mol %) is developed as an efficient and cost effective acid catalyst for the simple one-pot synthesis of 9-aryl-1,8-dioxooctahydroxanthene derivatives. Reaction of aromatic aldehyde (1 equiv) and dimedone (2 equiv) in the presence of CaCl2 (20 mol %) in CHCl3 at room temperature gave the open chain analogue of 1,8-dioxooctahydroxanthene. Similarly, aq HBr (10 mol %) in water at reflux
Introduction of taurine (2-aminoethanesulfonic acid) as a green bio-organic catalyst for the promotion of organic reactions under green conditions
作者:Farhad Shirini、Nader Daneshvar
DOI:10.1039/c6ra15432h
日期:——
derivatives are simply prepared via a three-component reaction in the presence of taurine as the catalyst. All these reactions are performed in water, a green solvent. The advantages of using of taurine as the catalyst are it is environmentally friendly, low cost, commercially available, easy to separate from the reaction mixture, and has high reusability. Use of this catalyst results in acceptable reaction
Preparation and study of the catalytic application in the synthesis of xanthenedione pharmaceuticals of a hybrid nano-system based on copper, zinc and iron nanoparticles
pharmaceutical derivatives from aldehyde and dimedone. Due to the magnetic behavior of the catalyst, the purification process is carried out with high convenience. Herein, a plausible mechanism for the catalytic process is suggested and reusability of the presented catalyst is also investigated. In this report, it has been well-proven that high reaction yields are obtained for xanthenedione derivatives under
Carbon-based nanocatalyst: An efficient and recyclable heterogeneous catalyst for one-pot synthesis of gem-bisamides, hexahydroacridine-1,8-diones and 1,8-dioxo-octahydroxanthenes
作者:Jaspreet Kour、Monika Gupta、Bushra Chowhan、Vivek K. Gupta
DOI:10.1007/s13738-019-01723-1
日期:2019.12
acid as a solid acid catalyst. This nanocatalyst is recyclable and also exhibited very high activity. Novel carbon-based nanocatalyst, i.e. cellulose[2-(sulfooxy)ethyl]mercaptosulfonic acid[SEMSA] was successfully synthesized by reacting mercaptoethanol and chlorosulfonic acid, and the catalytic activity of the prepared catalysts was evaluated for the one-pot synthesis of gem-bisamides from various aldehydes
摘要在此摘要中,我们讨论了磺化碳基材料在各种酸催化的有机转化中的进展,然后将其进一步应用于医学领域,实验室和工业中。采用一种简单新颖的方法制备了碳基纳米催化剂,即纤维素[2-(磺氧基)乙基]巯基磺酸作为固体酸催化剂。该纳米催化剂是可回收的,并且还表现出非常高的活性。巯基乙醇与氯磺酸反应成功合成了新型的碳纳米催化剂纤维素[2-(磺氧基)乙基]巯基磺酸[SEMSA],并评价了所制备催化剂的催化活性,用于一锅法合成宝石。-通过醛和二甲酮与芳族醛,二甲酮和乙酸铵或芳香胺和1,8-二氧-八氢氧杂蒽的三组分缩合,可得自各种醛和苯甲酰胺的双酰胺,六氢ac啶-1,8-二酮。与传统的合成方法相比,这种新的非均相纳米催化剂系统的应用具有高收率,反应时间短,生态友好,操作简便的优点,并且已通过1 H等研究确定了合成产物核磁共振和131 H NMR。在各种催化剂中,发现该纳米催化剂,即纤维素[2-(磺氧基)乙基]