The combination of isatins, active methylene reagents and 4-phenylurazole/ phthalhydrazide in the presence of ionic liquid ([BMIm]Cl) as a solvent catalyst was found to be a suitable and efficient method for the synthesis of the biologically important spirooxindoles. The features of this procedure were characterized by one-pot procedure, reasonable reaction times, fairly high yields, and simple isolation procedures. The ionic liquid can be easily separated and reused for several times.
KEYWORDS
Ionic liquidMulti-compound reactions Spirooxindole Isatin Pyrazole
Graphical AbstractAn efficient approach to the synthesis ...
Mass magnetization of magnetite nanoparticles was enhanced by disassembling and encapsulating their building nano-crystallites with watersoluble starch. Incorporation of iodine into the as-prepared nanoconglomerate led to formation of a ternary nano-complex and further enhancement of its superparamagnetic susceptibility. As an additional evidence for the anomalously heightened superparamagnetic property, the ternary nanocomplex showed lower magnetic remanence and coercivity than the pristine magnetite it was made from. These findings were ascribed to significant changes in, at least, size of the magnetite nano-crystallites during formation of the nano-composite. A significant enhancement was also observed in the catalytic efficiency of the nano-composite, as was successfully exemplified in the synthesis of some novel spiro[oxindole-dihydropyridine]s via a threecomponent reaction between isatins, furan-2,4(3H,5H)-dione and aminouracils 'on water'.
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