Introduction of an efficient DABCO-based bis-dicationic ionic salt catalyst for the synthesis of arylidenemalononitrile, pyran and polyhydroquinoline derivatives
Abstract —An affordable DABCO-based bis-dicationic ionic salt ([(DABCO)2C3H5OH]·2Cl) was utilized for the synthesis of arylidenemalononitrile, tetrahydrobenzo[b]pyran, pyrano[2,3-d]-pyrimidinone (thione), dihydropyrano[3,2-c]chromene, and polyhydroquinoline derivatives. The significant features of the presented method are ease of preparation and handling of the catalyst, high catalytic activity, short
The synthesis of bifunctional pyridine and quinolione derivatives were investigated using terephthalic and isophthalic aldehydes as a precursor. The reaction proceeds under microwave irradiation with good yield (70–92%) and short reaction time (7–9 min.). We provide a rapid and efficient method of synthesizing a range of bifunctional monocyclic and bicyclic products related to 1,4-dihydropyridines
In this work, Boehmite nanoparticles (BNPs) were synthesized in water using commercially available materials and further N,N,N′,N′-tetraethyldiethylentriamin (TEDETA) was supported on the surface of BNPs, and used as organo-basic catalyst in four-component Hantzsch reaction that provides access to pharmaceutically polyhydroquinoline derivatives and Knoevenagel reaction to afford α,β-unsaturated compounds. All products were obtained in excellent yields (89–98%) and good reaction times under green condition such as water and ethanol solvents. This catalyst was characterized using FT-IR, SEM, EDS, and TGA techniques. This catalyst was reused for several times without the significant loss of their catalytic efficiency. In addition, stability of catalyst after recycling was confirmed by TGA, SEM, EDS and FT-IR techniques.
Application of [Fe
<sub>3</sub>
O
<sub>4</sub>
@SiO
<sub>2</sub>
@(CH
<sub>2</sub>
)
<sub>3</sub>
Py]HSO
<sub>4</sub>
<sup>−</sup>
as heterogeneous and recyclable nanocatalyst for synthesis of polyhydroquinoline derivatives
作者:Sami Sajjadifar、Zahra Azmoudehfard
DOI:10.1002/aoc.5101
日期:2019.11
condensation reaction of aromatic aldehydes, dimedone, ethylacetoacetate and ammonium acetate in the presence of a catalytic amount of ionic liquid on silica‐coated Fe3O4 nanoparticles as a heterogeneous, recyclable and very efficient catalyst provided the corresponding polyhydroquinoline derivatives in good to excellent yields in ethanol under reflux condition. The [Fe3O4@SiO2@(CH2)3Py]HSO4− catalyst was
Nickel(II) immobilized on dithizone–boehmite nanoparticles: as a highly efficient and recyclable nanocatalyst for the synthesis of polyhydroquinolines and sulfoxidation reaction
of polyhydroquinoline derivatives and selectiveoxidation of sulfides to sulfoxides. The reactions not require very high temperatures or inert atmosphere. The developed heterogeneous catalyst could be easily separated by centrifugation and recycled for several runs without leaching of Nickel from the surface of the catalyst or significant loss of its catalytic activity.