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

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.

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ZrOCl2·8H2O as a highly efficient, eco-friendly and recyclable Lewis acid catalyst for one-pot synthesis of N-substituted pyrroles under solvent-free conditions at room temperature

Applied Organometallic Chemistry ◽

10.1002/aoc.1806 ◽

2011 ◽

Vol 25 (8) ◽

pp. 585-590 ◽

Cited By ~ 24

Author(s):

Ali Rahmatpour

Keyword(s):

Lewis Acid ◽

Room Temperature ◽

Acid Catalyst ◽

Solvent Free ◽

One Pot ◽

Highly Efficient ◽

One Pot Synthesis ◽

Solvent Free Conditions ◽

Lewis Acid Catalyst ◽

Substituted Pyrroles

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KAl(SO4)2 · 12H2O as a Recyclable Lewis Acid Catalyst for Synthesis of Some Amidoalkyl Naphthols Under Solvent-Free Conditions

Synthetic Communications ◽

10.1080/00397911.2010.522754 ◽

2011 ◽

Vol 42 (1) ◽

pp. 109-113 ◽

Cited By ~ 5

Author(s):

Hossein A. Oskooie ◽

Majid M. Heravi ◽

Narges Karimi ◽

Akram Amouchi ◽

Golnaz Kohansal

Keyword(s):

Lewis Acid ◽

Acid Catalyst ◽

Solvent Free ◽

Amidoalkyl Naphthols ◽

Solvent Free Conditions ◽

Lewis Acid Catalyst

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Antimony(III) chloride impregnated on alumina — An efficient and economical Lewis acid catalyst for one-pot synthesis of dihydropyrimidinones under solvent-free conditions

Canadian Journal of Chemistry ◽

10.1139/v06-019 ◽

2006 ◽

Vol 84 (3) ◽

pp. 433-437 ◽

Cited By ~ 21

Author(s):

Kamal K Kapoor ◽

Bilal A Ganai ◽

Satish Kumar ◽

Charanjeet S Andotra

Keyword(s):

Lewis Acid ◽

Condensation Reaction ◽

Thermal Conditions ◽

Acid Catalyst ◽

Solvent Free ◽

One Pot ◽

One Pot Synthesis ◽

Solvent Free Conditions ◽

Lewis Acid Catalyst

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.

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l-proline N-sulfonic acid-functionalized magnetic nanoparticles: a novel and magnetically reusable catalyst for one-pot synthesis of 3,4-dihydropyrimidine-2-(1H)-thiones under solvent-free conditions

RSC Advances ◽

10.1039/c6ra10558k ◽

2016 ◽

Vol 6 (64) ◽

pp. 59343-59351 ◽

Cited By ~ 10

Author(s):

M. Afradi ◽

N. Foroughifar ◽

H. Pasdar ◽

H. Moghanian

Keyword(s):

Magnetic Nanoparticles ◽

Sulfonic Acid ◽

Acid Catalyst ◽

Solvent Free ◽

Reusable Catalyst ◽

One Pot ◽

One Pot Synthesis ◽

Solvent Free Conditions ◽

Functionalized Magnetic Nanoparticles

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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