Potassium Triiodide. A New and Efficient Catalyst for Carbon–Carbon Bond Formation in Aqueous Media
作者:Ashim J. Thakur、Dipak Prajapati、Baikuntha J. Gogoi、Jagir S. Sandhu
DOI:10.1246/cl.2003.258
日期:2003.3
Potassiumtriiodide catalyses the condensation of carbonyl compounds with active methylene compounds in aqueous media to afford E olefinic products in high yields.
三碘化钾催化羰基化合物与活性亚甲基化合物在水性介质中的缩合反应,以高产率得到 E 烯烃产物。
The Knoevenagel condensation using quinine as an organocatalyst under solvent-free conditions
作者:Kavita Jain、Saikat Chaudhuri、Kuntal Pal、Kalpataru Das
DOI:10.1039/c8nj04219e
日期:——
organocatalyst to afford various electrophilic alkenes in excellent yields (up to 90%). In the presence of a catalytic amount of quinine (15 mol%), the reaction proceeded at room temperature (RT) undersolvent-freeconditions. In this green approach, the organocatalyst was recovered and recycled for up to four cycles without appreciable loss of activity.
Imidazolium Sulfonates as Environmental-Friendly Catalytic Systems for the Synthesis of Biologically Active 2-Amino-4<i>H</i>-chromenes: Mechanistic Insights
作者:Jacinto Velasco、Elena Pérez-Mayoral、Vanesa Calvino-Casilda、Antonio J. López-Peinado、Miguel A. Bañares、Elena Soriano
DOI:10.1021/acs.jpcb.5b06275
日期:2015.9.10
Liquids (ILs) are valuable reaction media extremely useful in industrial sustainable organic synthesis. We describe here the study on the multicomponent reaction (MCR) between salicylaldehyde (2) and ethyl cyanoacetate (3), catalyzed by imidazolium sulfonates, to form chromenes 1, a class of heterocyclic scaffolds exhibiting relevant biological activity. We have clarified the reaction mechanism by combining
One-pot four-component approach for the construction of dihydropyridines and dihydropyridinones using amines and activated alkynes
作者:Selvarangam E. Kiruthika、Paramasivan T. Perumal
DOI:10.1039/c3ra45850d
日期:——
An efficient greener approach for the one-pot four-component synthesis of dihydropyridines has been developed utilizing L-proline as a base catalyst under solvent-free conditions. This domino reaction involves Huisgen dipolar additions using amines and activated alkynes for the formation of novel dihydropyridines. The synthesized dihydropyridines were subjected to acid treatment which resulted in the