One-pot synthesis of 2,3-dihydroquinazolin-4(1H)-ones by Fe3O4@SiO2-imid-PMAn nano-catalyst under ultrasonic irradiation and reflux conditions

Green, cost‐effective and efficient procedure for Heck and Sonogashira coupling reactions using palladium nanoparticles supported on functionalized Fe3O4@SiO2 by polyvinyl alcohol as a highly active, durable and reusable catalyst

“…[24] The silica-coating process was typically done through the Stober approach (tetraethyl orthosilicate hydrolysis) and applied vigorously to reclaim MNPs with much more biological compatibility and stability. [25][26][27] One of the most essential reactions in modern synthetic chemistry is carbon-carbon (C-C) coupling reactions. [28] Transition metals or their various complexes have widely been applied as catalysts in many coupling techniques.…”

“…Aryl chlorides needed longer reaction times for completion and provided high yields of the expected products (Entries 21-26). In addition, aryl halides (I, Br, Cl) also underwent Sonogashira coupling reactions with aliphatic alkynes such as 1octyne and 1-ethynyl-1-cyclohexanol under the same conditions to afford the corresponding products in high yields ( Table 5, entries [27][28][29][30][31][32][33][34].…”

“…Impermeable dense silica layers have certainly been coated on the MNP cores to protect them from different erosion conditions . The silica‐coating process was typically done through the Stober approach (tetraethyl orthosilicate hydrolysis) and applied vigorously to reclaim MNPs with much more biological compatibility and stability …”

Ultrasound and Nano‐Catalysts: An Ideal and Sustainable Combination to Carry out Diverse Organic Transformations

“…After completion of the reaction the catalyst was recovered and recycled for the four successive runs without any loss in its catalytic activity. Very recently, in 2017, Esmaeilpour et al . also carried out the same reactions using silica supported phosphomolybdic acid (H 3 PMo 12 O 40 )‐immobilized Fe 3 O 4 nanoparticles (Fe 3 O 4 @SiO 2 ‐imid‐H 3 PMo 12 O 40 NPs) under ultrasonic irradiation in ethanol at room temperature (Table ).…”

Ionic Liquid-Functionalized Titanomagnetite Nanoparticles as Efficient and Recyclable Catalyst for Green Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones

“…Numerous strategies have been reported for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones in the literature using various catalytic systems and reaction conditions [42][43][44][45][46][47][48][49][50][51][52]. In this investigation, IL-modified Fe 3-x Ti x O 4 NPs were applied as a recyclable and heterogeneous nanocatalyst for the one-pot three-component synthesis of 2,3-dihydroquinazolin-4(1H)-onesunder solvent-free conditions.…”