Cu(II)-Schiff base/SBA-15 as an efficient catalyst for synthesis of decahydroacridine-1,8-diones

Abstract

Herein, we report a fast synthesis of 1,4-dihydropyridines, decahydroacridine-1,8-diones by one-pot multi-component reaction of 1,3cyclohexanedione or dimidone, arylaldehydes, and ammonium acetate under solvent-less condition using Cu(II)-schiff base-SBA-15 as a reusable heterogeneous catalyst in high yields. These kinds of catalysts are built from mesoporous silica SBA-15 which was covalently anchored with Cu(II) schiff base complex. The shorter reaction times, good yields, simple work-up procedure and environmentally friendly conditions are the main advantages of this method compared to the last one. This method is also the first example of synthesizing acridines by Cu(II)-schiff base-SBA-15 as an efficient catalyst in solvent-free media which can be valuable to be used or investigated for similar systems. The product was identified by its 1 H NMR, mass and IR spectra, which were compared to those reported previously.

Fe3O4‐supported Schiff‐base copper (II) complex: A valuable heterogeneous nanocatalyst for one‐pot synthesis of new pyrano[2,3‐b]pyridine‐3‐carboxamide derivatives

“…[18][19][20][21][22][23][24][25][26][27] Magnetic nanoparticles (MNPs) have recently received considerable attention both as solid support materials for a variety of homogeneous catalysts and as nanocatalysts in organic synthesis owing to their numerous benefits such as high stability, facile separation by external magnetic field, easy preparation and functionalization, and environmental benignity, as well as high surface area providing highly active sites on the particle surface and high loading capacity. [38][39][40][41] Multicomponent reactions take place between three or more reactants in which all or most of the atoms contribute to the newly formed product. [31,32] Owing to these unique features, MNPs-immobilized catalysts have been found to be more promising candidates in comparison to their non-supported homogeneous counterparts.…”

“…Among the eco-friendly processes, multicomponent reactions (MCRs) have attracted much interests as high atom-economy and convergent reactions. [38][39][40][41] Multicomponent reactions take place between three or more reactants in which all or most of the atoms contribute to the newly formed product. [42][43][44][45] Therefore, these reactions provide the scientists an efficient, time saving and atom economical approach to a wide variety of organic and bioorganic molecules including heterocyclic compounds.…”

Copper Schiff base functionalized polyaniline (Cu‐SB/PANI): A highly efficient polymer based organometallic catalyst for the synthesis of 2‐amino chromene derivatives

“…They can easily coordinate to metals through imine nitrogen. Moreover, they can stabilize various metals in different oxidation states, thus, monitoring their performance in various useful catalytic reactions …”

Lewis acid–catalyzed green synthesis and biological studies of pyrrolo[3,4‐c]pyrazoles in aqueous medium

“…Lewis acid‐promoted chemical reactions appreciably contribute to the development of new reaction strategies by allowing the replacement of hazardous organic solvents with environmentally safe and inexpensive solvents such as water to reduce the generation of toxic waste . Benzopyrano[3,2‐ c ]chromene‐6,8‐dione derivatives have been synthesized through an eco‐friendly approach using Cu (II)‐Schiff base/SBA‐15 in solvent‐free conditions, and 2,4,5‐trisubstituted imidazoles have been synthesized using CoFe 2 O 4 magnetic nanoparticles as benign catalyst …”