功能化石墨氮化碳 (Sg-C 3 N 4 ) 已被制造并用作可重复使用的催化剂,用于在水介质中一锅法生产各种螺吡喃色烯和螺吲哚-3,1'-萘四环体系。超声辅助方法已用于 gC 3 N 4的功能化。通过不同的分析工具表征催化剂的催化功能和结构完整性。Sg-C 3 N 4的催化位点特异性作用通过一锅反应序列中的各种对照实验得到证实。我们认识到 Sg-C 3 N 4作为第一个反应序列的双功能酸碱催化剂,而在各种螺吡喃色烯的单锅生产过程中,它是第二个反应序列的酸性催化剂。此外,Sg-C 3 N 4的双功能酸碱催化作用对于第一个反应序列已被证实,而在螺吲哚-3,1'-萘四环体系的一锅法生产过程中,它对第二个反应序列具有基本催化作用。多种 C-C、C-O 和 C-N 键、六元环、立体中心和螺骨架在单一反应中形成,增强了杀菌性能,并可能导致发现新的药用特性。Sg-C 3 N 4的温和反应环境、简单的后处
Efficient One-Pot Synthesis of Spirooxindole Derivatives Catalyzed by <scp>l</scp>-Proline in Aqueous Medium
作者:Yuling Li、Hui Chen、Chunling Shi、Daqing Shi、Shunjun Ji
DOI:10.1021/cc9001185
日期:2010.3.8
An efficient one-potsynthesis of spirooxindole derivatives by three-component reaction of isatins, malononitrile (cyanoacetic ester) and 1,3-dicarbonyl compounds in water in the presence of l-proline is reported. This new protocol has the advantages of environmental friendliness, higher yields, shorter reaction times, low cost, and convenient operation.
A clean and expedient synthesis of spirooxindoles in aqueous media catalyzed over nanocrystalline MgO
作者:Bikash Karmakar、Anupam Nayak、Julie Banerji
DOI:10.1016/j.tetlet.2012.07.030
日期:2012.9
An efficient and eco-friendly method for the synthesis of spirooxindoles with fused tetrahydrochromenes has been demonstrated using basic nanocrystalline MgO catalyst in aqueous condition. The method has been applied for the synthesis of a range of compounds with variable functionalities in excellent yield and selectivity.
condensation of isatins, malononitrile or methyl cyanoacetate or ethyl cyanoacetate, and 4‐hydroxycoumarin in water solvent. SBA‐Pr‐SO3H was proved to be an efficient heterogeneous nanoporous solid acid catalyst with a pore size of 6 nm that could be easily handled and removed from the reaction mixture by simple filtration and can be recovered and reused for several times without any loss of activity.
Synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] and spiro[indoline-3,4′-pyrano[2,3-c]chromene] derivatives using silica-bonded ionic liquids as a recyclable catalyst in aqueous medium
recyclable catalyst for the synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazoles] via one-pot condensation reaction of isatin, activated methylene reagents, and 3-methyl-l-phenyl-5-pyrazolone in refluxing aqueous medium in good to high yields. Also, these silica-bonded ionic liquids were used as catalysts for the synthesis of spiro[indoline-3,4′-pyrano[2,3-c]chromene derivatives in refluxing aqueous medium
One-Pot Synthesis of Biologically Important Spiro-2-amino-4<i>H</i>-pyrans, Spiroacenaphthylenes, and Spirooxindoles Using DBU as a Green and Recyclable Catalyst in Aqueous Medium
作者:Pooja Saluja、Komal Aggarwal、Jitender M. Khurana
DOI:10.1080/00397911.2012.760130
日期:2013.12.17
Abstract We have reported DBU-catalyzed one-potsynthesis of biologically and pharmacologically important spiropyrans from condensation of malononitrile/ethyl cyanoacetate, 1,3-dicarbonyl compounds, and ninhydrin/acenaphthequinone/istain in good yields. This new protocol employing DBU, which is a green, recyclable, and inexpensive catalyst, offers advantages such as mild reaction conditions, short