Evaluation of Nano-Fe3O4 as a Green Catalyst for the Synthesis of Mono, bis and tris Diindolyl Methanes

Fast and clean synthesis of mono, bis and tris diindolylmethanes from various aldehydes and indoles in the presence of an efficient reusable catalyst, nano-Fe3O4, in high yield and short reaction time is reported

Evaluation of Nano-Fe3O4 as a Green Catalyst for the Synthesis of Mono, bis and tris Diindolyl Methanes

Fast and clean synthesis of mono, bis and tris diindolylmethanes from various aldehydes and indoles in the presence of an efficient reusable catalyst, nano-Fe3O4, in high yield and short reaction time is reported

One-pot Synthesis of Novel 2-pyrazolo-3-phenyl-1,3-thiazolidine-4-ones Using DSDABCOC as an Effective Media

Background: Thiazolidine compounds are known to show interesting pharmacological activity. In particular, they are used as antiseizure, fungicidal, anti-bacterial, antitubercular, antiinflammatory, antiamoebic, anti-diabetic and local anesthetic agents. Some of these compounds have also shown antiparkinsonism, antioxidant, anticonvulsant, hypoglycemic and non-narcotic analgesic activities. On the other hand, pyrazoles have shown antibacterial, antitumor, antiviral, antifungal, anti-tubercular, antiparasitic, anesthetic, anti-diabetic, anti-inflammatory, analgesic and insecticidal activities. In order to improve the pharmacological effects of thiazolidine-4-ones, new pyrazole derivatives have been synthesized. Material and Methods: A mixture of pyrazolcarbaldehydes, anilines, thioglycolic acid and DSDABCOC was stirred at room temperature for the required reaction times. The progress of the reaction was monitored by TLC (EtOAc: petroleum ether 1:3). After completion of the reaction as indicated by TLC, the ionic liquid was separated by extraction with 2×15 mL of water. The solid residue was separated by column chromatography. The product was recrystallized from EtOH. The pure products were collected in 82-92% yields. Results: In continuation of our ongoing studies to synthesize heterocyclic and pharmaceutical compounds under mild and practical protocols, we wish to report herein our experimental results on the ultrasound promoted synthesis of 2-pyrazolo-3-phenyl-1,3-thiazolidine-4-ones using various synthesized pyrazolecarbaldehydes, anilines and thioglycolic acid at room temperature. The results illustrated that ionic liquid DSDABCOC certainly improved the yield of the products and reduced the reaction time. Conclusion: In conclusion, we have developed an efficient and simple protocol for the synthesis of novel pyrazolo-1,3-thiazolidine-4-ones using DSDABCOC as an ionic liquid. The easy workup together with the use of inexpensive, reusable and eco-friendly ionic liquid is the notable feature of this novel procedure. To the best of our knowledge, this is the first report of the synthesis of a new library of 1,3-thiazolidine-4-ones bearing a pyrazolyl moiety that enhances the biological activity under solvent-free conditions. </jats:sec

NiFe2O4@SiO2 n Pr@glucose Catalyzed Synthesis of Novel 5-pyrazolin-1,2,4- triazazolidine-3-ones (thiones)

Introduction: NiFe2O4@SiO2nPr@glucose catalyzed synthesis of novel 5-pyrazolin-1,2,4-triazazolidine- 3-ones (thiones). Materials and Methods: Amino glucose-functionalized silica-coated NiFe2O4 nanoparticles (NiFe2O4@SiO2 nPr@glucose amine or NiFe2O4@SiP@GA) were synthesized and characterized by X-ray powder diffraction (XRD), X-ray spectroscopy (EDX), transmission electron microscope (TEM), field emission scanning electron microscope (FE-SEM), vibrating sample magnetometry (VSM) and fourier transform infrared spectroscopy (FTIR). Results and Discussion: NiFe2O4@SiP@GA supply an eco-friendly procedure for the synthesis of some novel 5- pyrazolin-1,2,4-triazazolidine-3-ones or thiones through one-pot reaction of thiosemicarbazide (hydrazinecarbothioamide) and synthetized pyrazole carbaldehydes. These compounds were obtained in high yields in short reaction times. The catalyst could be easily recovered and reused for six cycles with almost consistent activity. The structures of the synthesized 5-pyrazolin-1,2,4-triazazolidine-3-ones or thiones were confirmed by 1H NMR, 13C NMR and FTIR spectral data and elemental analyses. Conclusion: In conclusion, we have investigated NiFe2O4@SiO2nPr@amino glucose as a new, eco-friendly, inexpensive, mild and reusable catalyst for the synthesis of 5-pyrazolin-1,2,4-triazazolidine-3-ones or thiones. High yield, a simple work.up procedure, adherence to the basics of green chemistry, environmental friendly and based on natural ingredients, ease of separation and recyclability of the magnetic catalyst and waste reduction are some advantages of this method. </jats:sec