1-(4-Sulfonic Acid Butyl)-3-Methylimidazolium Polyoxo Metalate as a Novel Nano-Hybrid Catalyst for the One-Pot Synthesis of 4H-Pyran and Spiro Indoline Derivatives

Merging decatungstate photocatalysis and copper‐catalyzed azide‐alkyne cycloaddition reaction for the formation of 1,2,3‐triazoles in water†

“…31 In the first step, the generated catalytically active copper(I) species (7) causes the reduction of the electron density of the alkyne by forming the dinuclear copper-acetylide (10). This enables the facile attack by the organoazide as nucleophile, resulting in the formation of acetylidecopper complex (11). Then, the copper-acetylide reacts with the azide derivative forming a six-membered copper-metalated triazolide intermediate (12) which in turn leads to the triazolyl-copper motif (13).…”

“…[7][8][9][10] The search for a sustainable approach as an alternative to these strategies may have advantages in terms of low cost of energy, by using natural resources, decreasing reaction times and reaction work-up and recovery of the active catalyst. In this respect, we chose to use polyoxometalates (POMs) known for their rich photocatalytic properties and various applications in different domains such as catalysis, 11 electrochemistry, 12 medicine, 13 photochromism, 14 and magnetism. 15 This family of photocatalytic materials is also emerging as promising photocatalysts that mediate organic chemistry reactions due to their low cost, high chemical and thermal stabilities, good solubility in water, electron-rich properties, and more importantly for their high UV-visible light absorption.…”

Synergistic applications of nanocomposite, ultrasound, and on‐water synthesis for efficient and green synthesis of spirooxindole derivatives via cascade C–N, C–O, and C–S bond formation

“…Recently, different protocols have been developed for the synthesis of spirooxindole derivatives using several catalysts via MCRs. 21,[30][31][32][33][34] But many of these described methods have experienced from one or more disadvantages like low yield, use of toxic chemicals, long reaction time, lack of diversity, difficulty in recovery, and reusability of the catalyst. 35 Dadaei et al 36 synthesized spirooxindole derivatives via formation of C-O bond using guanidine functionalized core-shell structured magnetic cobalt-ferrite in aqueous medium under ultrasound conditions.…”

“…The alarming growth of high‐throughput drug screening necessitates the development of eco‐benign methods for the synthesis of library of spirooxindole heterocycles. Recently, different protocols have been developed for the synthesis of spirooxindole derivatives using several catalysts via MCRs 21,30–34 . But many of these described methods have experienced from one or more disadvantages like low yield, use of toxic chemicals, long reaction time, lack of diversity, difficulty in recovery, and reusability of the catalyst 35…”

Synthesis of novel azo‐linked 4‐arylidene‐benzodiazepine using cellulose@SP@catechin@Fe3O4 nanocomposite and study of their antioxidant activity

“…Given the significance of these properties, a wide range of synthetic multicomponent reactions has been documented for these heterocyclic compounds. [16][17][18][19][20][21][22][23] Synthesis routes for benzodiazepine have been documented utilizing various catalysts, including Tris (hydrogensulfato)boron [B (HSO 4 ) 3 ], 24 Fe (OTs) 3 /SiO 2, 25 Fe 3 O 4, 26 nicotine-based organocatalyst supported on silica nanoparticles (Fe [III]-NicTC@nSiO 2 ), 27 ytterbium (III) trifluoromethanesulfonate, 28 polyphosphoric acid, 29 graphene oxide nanosheets, 30 Lanthanum oxide [La 2 O 3 ] and Lanthanum hydroxide [La (OH) 3 ], 31 ZnS nanoparticles, 32 H 3 PMo 12 O 40 , 33 aluminum (III) 2-Aminoterephthalic metal-organic framework (NH 2 -MIL-101[Al]), 34 Fe 3 O 4 @chitosan, 35 sulfated polyborate, 36 Er (III) triflate, 37 ferrocene-supported activated carbon (FC/AC). 38 The advent of science and nanotechnologies has propelled the utilization of nanocatalysts to the forefront of both research and industrial endeavors.…”