Monoclinic zirconia nanoparticle-catalyzed regioselective synthesis of some novel substituted spirooxindoles through one-pot multicomponent reaction in a ball mill: A step toward green and sustainable chemistry
ABSTRACT A highly efficient, green as well as atom economical protocol for the synthesis of substituted spirooxindoles from m-ZrO2 NPs catalyzed multicomponent reaction of isatin derivatives with ethyl cyanoacetate and 1,3-dicarbonyl compounds in a ball mill has been established. Because of the simple and readily available starting materials, easy operation, and high bioactivity of substituted spirooxindoles
Immobilization of 1,4-Diazabicyclo[2.2.2]Octane (DABCO) over Mesoporous Silica SBA-15: An Efficient Approach for the Synthesis of Functionalized Spirochromenes
作者:Robabeh Baharfar、Razieh Azimi
DOI:10.1080/00397911.2013.789527
日期:2014.1.2
Immobilized 1,4-diazabicyclo[2.2.2]octane (DABCO) over mesoporous silica SBA-15 has been found to be an efficient heterogeneous base catalyst for the synthesis of biologically active functionalized spirochromene derivatives via three-component reaction of isatins/acenaphthoquinone, activated methylene reagents, and 1,3-dicarbonyl compounds in aqueous media. This ecofriendly protocol offers several advantages such as a cost-effective procedure with excellent yield, short reaction time, simple workup, recovery and reusability of catalyst, good functional group tolerance, and broad scope of usable substrates. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resource(s): Full experimental and spectral details.]
Environmentally friendly synthesis of Ag/SiO2 nanoparticles using Thymus kotschyanus extract and its application as a green catalyst for synthesis of spirooxindoles
作者:Razieh Azimi、Zahra Lasemi
DOI:10.1007/s11164-022-04667-z
日期:2022.4
of Ag/SiO2 nanoparticles is 25–60 nm. The Ag/SiO2 nanoparticles act as an environmentally friendly heterogeneous catalyst in the synthesis of spirooxindoles via the three-component condensation reaction of isatins, activated methylene reagents, and 1,3-dicarbonylcompounds in aqueous media, and the desired products were obtained with yields ranging from 90 to 98%. The catalyst can be recovered easily
今天,基于合成程序的植物提取物已引起人们对传统方法(如物理和化学程序)合成纳米材料的考虑。纳米材料的绿色合成因其无害、经济、可行的方法等诸多优点而成为人们关注的领域,在生物医学、纳米技术和纳米光电子学等领域具有多种应用,并可作为各种有机转化的催化剂。在这项研究中,银纳米粒子通过 Ag +的原位还原沉积在纳米二氧化硅球的表面上。使用百里香地上部分的水提取物作为天然还原剂和封端剂的离子。紫外-可见 (UV-Vis) 光谱仪、傅里叶变换红外光谱 (FT-IR)、热重分析、扫描电子显微镜与能量色散 X 射线光谱 (SEM-EDS) 和 X 射线粉末衍射记录的结果支持 Ag/SiO 2纳米粒子的生物合成和表征。结果表明Ag/SiO 2纳米粒子的平均尺寸为25-60 nm。Ag/SiO 2纳米粒子作为环境友好型多相催化剂,通过靛红、活化亚甲基试剂和 1,3-二羰基化合物在水介质中的三组分缩合反应合成螺羟吲哚,得到所需产物,产率在