Prolinamide functionalized polyacrylonitrile fiber with tunable linker length and surface microenvironment as efficient catalyst for Knoevenagel condensation and related multicomponent tandem reactions
attaching amines to fiber matrix as well as the constructed hydrophobic microenvironment by linker group within the surface layers of fiber materials effectively promotes the reactions. In addition, the good swollen capacity of fiber in solvent ensure that the reaction proceed well. Fiber catalyst PANPA−2F modified by prolinamide with a C2 alkyl chain exhibited the best catalytic performance and can
Knoevenagel Condensation Shadowed by Michael Addition & O-Alkylation of Resorcinol, Malononitrile and Benzadehyde to form Pyrrolidine, Piperidine and Morpholine Substituted Benzopyran Derivatives in Dry K2CO3
作者:Avidha Kulshrestha、Jaya Pandey、Deepa Panhekar
DOI:10.14233/ajchem.2019.21901
日期:2019.6.10
A condensation reaction of resorcinol, malononitrile and benzaldehyde in presence of sodium carbonate at room temperature on vigorous stirring gives 2-amino-7-hydroxy-4-phenyl-4H-1-benzopyran-3-carbonitrile which on alkylation in presence of dry potassium carbonate in dry acetone at 70-80 ºC with 1,2-chloroethyl pyrrolidine, 1,2-chloroethyl piperidine, 1,2-chloroethyl morpholine gives corresponding novel compounds.
Tungstic acid functionalized mesoporous SBA-15: A novel heterogeneous catalyst for facile one-pot synthesis of 2-amino-4H-chromenes in aqueous medium
作者:Sudipta K. Kundu、John Mondal、Asim Bhaumik
DOI:10.1039/c3dt50947h
日期:——
A new highly ordered mesoporous tungstic acid functionalized SBA-15, TAFMC-1 has been synthesized via post-synthesis modification of mesoporousSBA-15 with (3-chloropropyl) triethoxysilane followed by substitution reaction of chlorine atom of the 3-chloropropyl group by tungstic acid group under refluxing conditions in n-hexane. The tungstic acid functionalized mesoporoussilica material has been characterized
New ruthenium(<scp>ii</scp>) catalysts enable the synthesis of 2-amino-4<i>H</i>-chromenes using primary alcohols <i>via</i> acceptorless dehydrogenative coupling
作者:Veerappan Tamilthendral、Rengan Ramesh、Jan Grzegorz Malecki
DOI:10.1039/d2nj03268f
日期:——
acceptorless dehydrogenative coupling of substituted benzyl alcohols, resorcinol, and malononitrile. The present catalytic protocol furnishes a variety of 2-amino-4H-chromenes in high yields of up to 95% from a wide range of readily available primary alcohols without the use of any oxidant/additives utilizing low catalyst loading. A plausible mechanism for the catalytic synthesis of 2-amino-4H-chromene compounds
通过包含 N-O 螯合咔唑基腙配体的对伞花烃 Ru( II ) 有机金属络合物催化的一锅多组分反应,合成了一系列具有不同取代基功能的具有生物学意义的 2-氨基-4 H-色烯。使用各种光谱(FT-IR、UV-vis、NMR 和 HR-MS)和分析方法合成和表征了一组对伞花烃 Ru( II ) 配合物。借助单晶 X 射线衍射研究证实了其中一种配合物的分子结构。2-氨基-4 H-色烯衍生物已在温和条件下通过钌( II) 催化剂介导的取代苯甲醇、间苯二酚和丙二腈的无受体脱氢偶联。本催化协议提供了各种 2-氨基-4 H-色烯,从各种容易获得的伯醇中以高达 95% 的高产率提供,而无需使用任何利用低催化剂负载的氧化剂/添加剂。通过醛和亚苄基丙二腈中间体的形成以及水和氢作为副产物的排放,已经描述了催化合成 2-氨基-4 H-色烯化合物的合理机制。有趣的是,从合成的 2-氨基-4 H-色烯中成功构建了具有良好收率的药用重要的他克林类似物。
Bimetallic nanoparticles supported ionic liquid as an effective heterogeneous nanocatalyst for green synthesis of chromenes under solvent‐free conditions
作者:Somayeh Kazempour、Hossein Naeimi
DOI:10.1002/aoc.6903
日期:2022.12
In this research, a novel bimetallic nanoparticles supported by 1,3-bis (triethoxysilylpropyl) imidazolium hydrogen sulfate ionicliquid (Ni.Cu@SiO2.BSPIm/HSO4) are designed and prepared, and its catalytic activity is investigated in organic reaction. The prepared nanocatalyst was characterized using Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray, thermogravimetric analysis
本研究设计并制备了1,3-双(三乙氧基甲硅烷基丙基)咪唑硫酸氢离子液体负载的新型双金属纳米粒子(Ni.Cu@SiO 2 .BSPIm/HSO 4),并研究了其在有机反应中的催化活性。 . 使用傅里叶变换红外光谱 (FT-IR)、能量色散 X 射线、热重分析、场发射扫描电子显微镜和 X 射线粉末衍射技术对制备的纳米催化剂进行了表征。该催化剂在通过缩合反应一锅法合成色烯衍生物中表现出很好的活性。产品纯度高,收率高,反应时间短。有机产物通过熔点、FT-IR 和1H 核磁共振分析。