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
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]
Nickel nanoparticles: A highly efficient catalyst for one pot synthesis of tetraketones and biscoumarins
作者:JITENDER M. KHURANA、KANIKA VIJ
DOI:10.1007/s12039-012-0275-8
日期:2012.7
nickel nanoparticles have been used as a catalyst for promoting the synthesis of 2,2′-aryl-methylene bis(3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one), 2,2′-aryl-methylene bis(3-hydroxy-2-cyclohexene-1-one), also known as tetraketones, and biscoumarins via Knoevenagel condensation followed by rapid Michael addition. A novel and highly efficient PVP stabilized Ni nanoparticle catalysed synthesis of tetraketones
Copper (0) nanoparticles onto silica: A stable and facile catalyst for one-pot synthesis of 2,2′-arylmethylene bis (3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) via cascade Knoevenagel/Michael reaction
作者:MANJULLA GUPTA、MONIKA GUPTA
DOI:10.1007/s12039-016-1080-6
日期:2016.5
Solid supported copper (0) nanoparticles were prepared by physical adsorption of copper (0) nanoparticles (synthesized through bottom-up approach) on the solid supports such as silica, HAP, cellulose and basic alumina. Studies comparing these supported catalysts were done with the synthesis of arylmethylene-bis-(3-hydroxy-2-cyclohexene-1-one) via the cascade Knoevenagel/Michael reaction. The highly