An efficient and simple synthetic approach has been developed for the preparation of biologically interesting spiro[oxindole-3,4'-(4′H-pyran)] derivatives via visible light-mediated one-pot, three-component reaction of isatins, 1,3-dicarbonylcompounds and malononitrile by using an inexpensive organic dye, Na2 eosin Y, as the photocatalyst in aqueous ethyl lactate at ambient temperature. The substrate
One-Pot Three-Component Synthesis of Spirooxindoles Catalyzed by Hexamethylenetetramine in Water
作者:Guo-Dong Wang、Xiao-Nan Zhang、Zhan-Hui Zhang
DOI:10.1002/jhet.994
日期:2013.1
convenient, and multicomponent strategy for synthesis of spirooxindole derivatives has been developed. This strategy provides a rapid access to construct a diversity‐oriented library of spirooxindoles by using three simple and readily available isatin, malononitrile or cyanoacetic ester, and 1,3‐dicarbonyl compound catalyzed by hexamethylenetetramine in water.
Green multi-component domino reactions (MCRs)1–7 for the synthesis of fine chemicals have attracted much recent interest.8–9 Quinolines, spiro[4H-pyran-oxindoles] and xanthenes are reported as havi...
CsxH3-xPW12O40 nanoparticles dispersed in the porous network of Zr-pillared α-zirconium phosphate as efficient heterogeneous catalyst for synthesis of spirooxindoles
作者:Sagnika Pradhan、B.G. Mishra
DOI:10.1016/j.mcat.2017.12.013
日期:2018.2
Layered α-zirconiumphosphate (α-ZrP) was prepared by reflux method using ZrOCl2.8H2O and H3PO4 as precursor. The α-ZrP material was pillared with Zr-oxyhydroxy nanoclusters to prepare Zr-pillared α-zirconiumphosphate (ZZP). An enhancement in interlayer spacing, surface area and porosity was noticed as a result of Zr-pillaring. The cesium exchanged phosphotungstic acid (CsxH3-xPW12O40) nanoparticles
层状磷酸α-锆(α-的ZrP)用回流的ZrOCl方法制备2 8H 2氧,氢3 PO 4作为前体。α-ZrP材料以Zr-羟基羟基纳米团簇为基,以制备Zr柱状α-磷酸锆(ZZP)。Zr堆积导致了层间距,表面积和孔隙率的增加。将铯交换的磷钨酸(Cs x H 3-x PW 12 O 40)纳米颗粒分散在ZZP材料的多孔基质中,制备Cs x H 3-x PW 12 O 40-ZZP纳米复合材料系统。使用XRD,FTIR,UV-vis-DRS,TGA-DTA,XPS,N 2吸附,TPD,FESEM和HRTEM技术对纳米复合材料进行了表征。从XRD可以看出,α-ZrP的层状结构在立柱时发生膨胀,并随后保留在复合材料中。UV-vis和FTIR研究表明ZZP夹层中Cs x H 3-x PW 12 O 40纳米团簇的结构完整性。复合材料的表面积在80–130 m 2 g -1的范围内。与ZP和ZZP材料相比
An efficient one-pot multi-component synthesis of spirooxindoles using Fe3O4/g-C3N4 nanocomposite as a green and reusable catalyst in aqueous media
作者:Fatemeh Kamali、Farhad Shirini
DOI:10.1016/j.molstruc.2020.129654
日期:2021.3
Abstract In this study, an efficacious method is described for the synthesis of spirooxindole derivatives using Fe3O4/g-C3N4 as a green catalyst. This is a one-pot three-component condensation in water as a clean and environmentally favorable media. The present procedure proposes various remarkable privileges such as mild reaction conditions, simple work-up procedure and environment friendly. Moreover