通过一种安全,简单的化学方法在水性介质中合成了1,3-丙二磺酸丙磺酸铵[(PDA)(MeSO 3)],作为第一类纳米脂肪族铵盐。[(PDA)(MeSO 3)]铵盐通过XRD,TEM,SEM,EDS,DLS,AFM,1 H NMR,13 C NMR,FT-IR,TG和元素分析进行表征。[(PDA)(MeSO 3)]铵盐被有效地用作2-氨基-3-氰基-4 H一锅三组分合成的生态友好型可回收有机催化剂-吡喃衍生物。从经济和环境的观点来看,这种新型催化剂具有环境友好,产率高,反应时间短,后处理简单,易于操作,避免有机溶剂和廉价催化剂的优点。
Ethylenediammonium diformate (EDDF) in PEG600: an efficient ambiphilic novel catalytic system for the one-pot synthesis of 4H-pyrans via Knoevenagel condensation
作者:Anuj Thakur、Mohit Tripathi、U. Chinna Rajesh、Diwan S. Rawat
DOI:10.1039/c3ra42410c
日期:——
system was developed as a catalyst for the Knoevenagel condensation and Knoevenagel initiated three-componentone-potsynthesis of 4H-pyrans at room temperature with high yields and in short reaction times. Further, the EDDF-PEG600 catalytic system was recycled six times without any appreciable loss in its activity and hence can be termed as a green, environmentally benign catalytic system. A plausible
Evaluation of magnetically recyclable nano-Fe3O4 as a green catalyst for the synthesis of mono- and bis-tetrahydro-4H-chromene and mono and bis 1,4-dihydropyridine derivatives
Magnetically separable Fe3O4 nanoparticles were used as an environmental friendly catalyst for the synthesis of mono- and bis-tetrahydro-4H-chromene and mono- and bis-1,4-dihydropyridine derivatives via three-component reactions of aromatic aldehydes and malononitrile with cyclic β-dicarbonyls or cyclic β-enaminoketones respectively. These reactions were carried out in EtOH and at reflux. Fe3O4 nanoparticles can be magnetically separated from the reaction mixture by a magnet and recycled without significant loss of catalytic activity.
Synthesis of pyranopyrazoles, benzopyrans, amino-2-chromenes and dihydropyrano[c]chromenes using ionic liquid with dual Brønsted acidic and Lewis basic sites
efficient ionicliquid with both Brønstedacidic and Lewis basic sites, namely 1,4-dimethyl-1-(4-sulphobutyl)piperazinium hydrogen sulphate (IL1), was synthesised and characterised. IL1 is a “green”, homogeneous and reusablecatalyst for: i) the synthesis of pyranopyrazoles (Va-Vj)and benzopyrans (VIa-VIj and VIIa-VIIf) at ambient temperature under solvent-free conditions and ii) the synthesis of amino-2-chromenes
Cheap thiamine hydrochloride as efficient catalyst for synthesis of 4H-benzo[b]pyrans in aqueous ethanol
作者:Lu Chen、Sunan Bao、Lixiang Yang、Xian Zhang、Bin Li、Yibiao Li
DOI:10.1007/s11164-016-2843-x
日期:2017.7
Preparation of pharmaceutically active 2-amino-4H-pyran derivatives has been achieved using cheap thiamine hydrochloride as catalyst. A wide range of aromatic aldehydes easily undergo condensation with malononitrile and several kinds of 1,3-cyclohexanedione under mild condition to afford the desired product with good purity in excellent yield. This protocol has various advantages as a simple, clean, and environmentally benign three-component process.
Crown ether complex cation ionic liquids: synthesis and catalytic applications for the synthesis of tetrahydro-4<i>H</i>-chromene and 1,4-dihydropyridine derivatives
作者:Mehdi Abaszadeh、Mohammad Seifi
DOI:10.1080/17415993.2017.1293058
日期:2017.7.4
ABSTRACT A series of crownethercomplex cation ionic liquids (CECILs) are synthesized by crownethers chelated with sodium benzenesulfonates, and used as a green and environmental catalyst, for the synthesis of tetrahydro-4H-chromene and 1,4-dihydropyridine derivatives by three-component reactions of aromatic aldehydes and malononitrile with cyclic β-dicarbonyls or cyclic β-enaminoketones respectively