Use of Nanomagnetic Sulfated Zirconia (Fe3 O4 @ZrO2 /SO4 2− ) as Sustainable Heterogeneous Acid Catalyst for Synthesis of Spiroheterocycles under Solvent-Free Conditions

2017 ◽  
Vol 2 (34) ◽  
pp. 11055-11061 ◽  
Author(s):  
Yogesh Kumar Tailor ◽  
Sarita Khandelwal ◽  
Ram Gopal ◽  
Esha Rushell ◽  
Anamika Prajapati ◽  
...  
2019 ◽  
Vol 8 (1) ◽  
pp. 600-610 ◽  
Author(s):  
Mercedes Muñoz ◽  
Gustavo Pasquale ◽  
Angel Gabriel Sathicq ◽  
Gustavo Pablo Romanelli ◽  
Carmen Inés Cabello ◽  
...  

Abstract The volcanic ash from the Andes mountain range (Puyehue-Cordon Caulle volcanic complex situated in western South America on the Argentinean-Chilean border) was used as heterogeneous acid catalyst in the suitable synthesis of 3H-1,5-benzodiazepines. The natural ashes were classified according to their particle size to generate the different catalytic materials. The catalysts were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), vibrational spectroscopies (FT-IR and Raman), and textural properties were determined by N2 adsorption (SBET). Potentiometric titration with n-butylamine was used to determine the acidic properties of the catalytic materials. Several 3H-1,5-benzodiazepines were obtained by reaction of o-phenylenediamine and substituted 1,3-diphenyl-1,3-propanedione in solvent-free conditions, giving good to excellent yields of a variety benzodiazepines. The method was carried out in environmentally friendly conditions and it was operationally simple. The volcanic ash resulted in a safe and recyclable catalyst.


2011 ◽  
Vol 42 (1) ◽  
pp. 109-113 ◽  
Author(s):  
Hossein A. Oskooie ◽  
Majid M. Heravi ◽  
Narges Karimi ◽  
Akram Amouchi ◽  
Golnaz Kohansal

2006 ◽  
Vol 84 (3) ◽  
pp. 433-437 ◽  
Author(s):  
Kamal K Kapoor ◽  
Bilal A Ganai ◽  
Satish Kumar ◽  
Charanjeet S Andotra

The antimony(III) chloride impregnated on alumina efficiently catalyses a one-pot, three-component condensation reaction among an aldehyde, a β-ketoester, and urea or thiourea to afford the corresponding dihydropyrimidinones in good to excellent yields. The reactions are probed in microwave (MW), ultrasonic, and thermal conditions and the best results are found using MW under solvent-free conditions.Key words: Biginelli dihydropyrimidinones synthesis, SbCl3–Al2O3, MW, sonication, solid supported.


RSC Advances ◽  
2016 ◽  
Vol 6 (64) ◽  
pp. 59343-59351 ◽  
Author(s):  
M. Afradi ◽  
N. Foroughifar ◽  
H. Pasdar ◽  
H. Moghanian

Synthesis, characterization and utilization of the l-proline N-sulfonic acid-functionalized magnetic nanoparticles as a novel magnetically reusable acid catalyst for the synthesis of 3,4-dihydropyrimidine-2-[1H]thione derivatives is reported.


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