Synthesis and applications of CoFe<sub>2</sub>O<sub>4</sub>nanoparticles for multicomponent reactions
作者:Jaspreet Kaur Rajput、Gagandeep Kaur
DOI:10.1039/c3cy00594a
日期:——
An efficient, simple, green protocol is developed for the synthesis of 2-amino-4-(phenyl)-5,6,7,8-tetrahydro-7,7-dimethyl-5-oxo-4H-chromene-3-carbonitrile derivatives and 2,2′-arylmethylene bis(3-hydroxy-5,5-dimethyl-2-cyclohexene-1-one) derivatives in the presence of CoFe2O4nanoparticles in aqueous ethanol medium. CoFe2O4nanoparticles have been synthesised by a co-precipitation method followed by
开发了一种高效,简单的绿色方案,用于合成2-氨基-4-(苯基)-5,6,7,8-四氢-7,7-二甲基-5-氧代-4 H-色烯-3-乙醇水溶液中在CoFe 2 O 4纳米粒子存在下,腈衍生物和2,2'-芳基亚甲基双(3-羟基-5,5-二甲基-2-环己烯-1-酮)衍生物。CoFe 2 O 4纳米颗粒已经通过共沉淀法随后超声合成。合成的CoFe 2 O 4纳米颗粒具有高表面积(140.9 m 2 g -1)和小尺寸(2-8 nm)。当使用含水介质时,本发明的催化方法提供了可持续性,通过提供高产率的产物,反应在短的反应时间内进行,并且由于催化剂便宜并且可以从反应混合物中回收,因此是经济的。回收的催化剂可以用于多个循环而不会损失很多活性。该方案是绿色的,因为未使用色谱技术,因此消除了使用有害有机溶剂的可能性。CoFe 2 O 4成为一种高效,可持续,稳定和可回收的催化剂。
One-pot synthesis of tetrahydrochromene derivatives catalyzed by lipase
An efficient and green one-potsynthesis route for tetrahydrochromene derivatives was developed. Lipase from Porcine pancreas (PPL) shows excellent catalytic activity and exerts good adaptability to different substrates in the reaction. All the reactions go smoothly and provide tetrahydrochromene derivatives with isolate yield up to 97% under room temperature. This lipase-catalyzed multistep conversion
the facile synthesis of pharmaceutically diverse 2-amino-5-oxo-4-aryl-5,6,7,8-tetrahydro-4 H -chromene-3-carbonitriles via a one-pot, threecomponentcondensation of aromatic aldehydes, malononitrile, and 1,3-cyclohexanedione or dimedone using 2-aminopyridine as an efficient alkaline organo catalyst is described. This new chemistry furnishes the desired heterocycles in very shorter reaction times with
In this paper, we report the use of bambooricehuskash as an efficient, greener, reusable, and biodegradable heterogeneous catalyst for the synthesis of tetrahydro‐4H‐chromene‐3‐carbonitriles via the one‐pot three‐component reaction of malononitrile with aromatic aldehydes and dimedone or 1,3‐cyclohexanedione. The formation of bambooricehuskash‐silica has been confirmed by several analytical techniques
A series of 4-aryl/heteroaryl-4H-fused pyrans was synthesized via multicomponent reaction in a microwave synthesizer. All the pyrans were evaluated for in vitro xanthine oxidase inhibition. Structure-activity relationship was also established. Among the series of 108 compounds, Compound 5n was the most potent displaying remarkable inhibition against the enzyme with an IC50 value of 0.59 mu M. Enzyme kinetic study was carried out for the compound 5n to determine the type of inhibition. The study revealed that the compound 5n was a mixed-type inhibitor. Molecular modelling studies were also performed to figure out the interactions of both the enantiomers of 5n with the amino acid residues of the enzyme.[GRAPHICS].