Magnetic polyborate nanoparticles as a green and efficient catalyst for one-pot four-component synthesis of highly substituted imidazole derivatives

Abstract

Magnetic polybiorate nanoparticles were prepared from H3BO3via a simple ball-milling procedure and explored as a green and highly efficient catalyst for the synthesis of tetra-substituted imidazoles from cascade cyclocondensation as well as in situ air oxidation.

Magnetic BiFeO3 Nanoparticles: A Robust and Efficient Nanocatalyst for the Green One-Pot Three-Component Synthesis of Highly Substituted 3,4-Dihydropyrimidine-2(1H)-one/thione Derivatives

“…The unique characteristics of DHPMs/DHPMTs derivatives and the ongoing challenges in their synthesis have inspired our quest for an innovative and efficient approach. In continuation of our interest in the synthesis of organic heterocycles according to the principles of green chemistry in the presence MNPs 29,31,32,[38][39][40][41][42][43] , we have investigated a novel method that demonstrates the catalytic capabilities of magnetic bismuth nanoparticles to address challenges and improves the entire synthesis process (Fig. 2).…”

Magnetic DL-methionine grafted to chitosan by EDTA linker nanomaterial: a highly efficient multifunctional organocatalyst for the synthesis of highly substituted imidazole derivatives under green conditions

“…In this regard, the MCRs of benzyl or benzoin with aldehydes, and primary amines or ammonium acetate is one of the most convenient protocols for synthesis of multi-substituted imidazole derivatives. [127][128][129][130] Following this issue, numerous heterogenous or homogenous catalytic systems including ZSM-11 or HY zeolite, dimethylpyridinium trinitromethanide, 3-picolinic acid, silica sulfuric acid, ZrO 2 -Al 2 O 3 , ZrO 2 -β-cyclodextrin, nano-Al-MCM-41, triethylammonium acetate as an ionic liquid, I 2 , Kegin-type hetero polyacids, chitosancoated Fe 3 O 4 nanoparticles, Fe 3 O 4 -PEG-Cu, Bohemite nanoparticles, silica choloride, 2,6-pyromellitic diamide-diacid bridged mesoporous organosilica nanospheres, (N 2 H 5 ) 2 SiF 6 , magnetic polyborate nanoparticles 131 and Fe 3 O 4 /SiO 2 decorated trimesic acid-melamine have been employed for the multicomponent synthesis of desired imidazole derivatives 70,100,[132][133][134][135][136] . Although these mentioned methods have several advantages, they suffer from several disadvantages such as using hazardous or expensive reagents, pollution created during the catalyst preparation, low stability or recyclability of the catalysts and also low yields of the desired products, long reaction times and di cult work-up procedures.…”

Functionalized graphene oxide by 4-amino-3-hydroxy-1-naphthalenesulfonic acid as a heterogeneous nanocatalyst for the one-pot synthesis of tetraketone and tetrahydrobenzo[b]pyran derivatives under green conditions

“…Recently, a wide range of MCRs have been developed using various catalysts. [41][42][43][44][45][46][47] MCR procedures have many advantages such as reducing product purication processes, good atom economy, preventing the formation of side products, reducing the use of solvents, and mild reaction conditions. MCRs are very attractive processes for the synthesis of a variety of polymers, heterocyclic compounds, and materials with biological properties, and provide a wide range of products oen having complex molecular structures in rapid and simple procedures.…”