Results 41 to 50 of about 843 (203)

Comparison of Catalytic Effect of Alkali and Alkaline Earth Metals Hydrogen Sulfate: As the Promoter for an Efficient Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones under Solvent-Free Conditions [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2005
Alkali and alkaline earth metals hydrogen sulfate catalyzed the one-pot three component condensation reactions of aldehydes, 1,3-dicarbonyl compounds and urea or thiourea under solvent-free conditions leading to 3,4-dihydropyrimidin-2(1H)-ones in high ...
Ahmad Shaabani, Ayoob Bazgir, Sakineh Arab Ameri, Masoumeh Sharifi Kiasaraie, Sima Samadi   +4 more
doaj  

Sulfated Zirconia-Catalyzed Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones (DHPMs) Under Solventless Conditions: Competitive Multicomponent Biginelli vs. Hantzsch Reactions

Molecules, 2006
The catalytic ability of ZrO2/SO42- to promote solventless three-componentcondensation reactions of a diversity of aromatic aldehydes, urea or thoiurea and ethylacetoacetate was studied.
Guillermo Negrón-Silva, Eduardo González-Zamora, Victor H. Lara-Corona, Leticia Lomas-Romero, Deyanira Angeles-Beltrán   +4 more
doaj   +1 more source

Synthesis and Antioxidant Activity of Novel Biginelli Adducts with Phenolic Fragments

Applied Sciences
In this work, eco-friendly ceric ammonium nitrate (CAN) and ferric chloride hexahydrate catalysts in ethanol/acetonitrile systems were used to efficiently synthesize novel dihydropyrimidinone (-thione) derivatives via the Biginelli reaction. The obtained
Olga V. Snastina, Erik R. Sabitov, Viktoria A. Kuricheva, Vladimir N. Koshelev   +3 more
doaj   +1 more source

An Efficient Synthesis of 5-Alkoxycarbonyl-4-aryl-3,4-dihydropyrimidin-2(1H)-ones Catalyzed by KSF Montmorillonite

Molecules, 2000
A mild and efficient catalytic method for synthesis of 5-alkoxycarbonyl-4-aryl-3,4- dihydropyrimidin-2(1H)-ones using KSF montmorillonite as catalyst is described.
Ziyi Zhang, Xianten Chen, Jinchang Ding, Haixia Lin   +3 more
doaj   +1 more source

A green approach for the multicomponent synthesis of polyhydroquinolines and 6-unsubstituted dihydropyrimidinones using novel highly proficient acidic ionic liquid [CEMIM][MSA] as a reusable catalyst

Catalysis Communications, 2022
Carboxylic acid functionalized imidazolium based novel acidic ionic liquid [CEMIM][MSA] was synthesized using economically feasible raw materials under very mild condition.
Priyanka Patil, Suresh Kadam, Dayanand Patil, Paresh More   +3 more
doaj   +1 more source

LiClO₄-catalyzed one-pot synthesis of dihydropyrimidinones: an improved protocol for Biginelli reaction

, 2001
Lithium perchlorate efficiently catalyzes the three-component condensation reaction of aldehyde, β-keto ester and urea in refluxing acetonitrile to afford the corresponding dihydropyrimidinones in high yields under neutral conditions. LiOTf is also found
Srinivas, R., Ramalingam, T., Yadav, Jhillu S., Venugopal, C., Subba Reddy, Basi V.   +4 more
core   +1 more source

Combinatorial Synthesis of 2-Thioxo-4-dihydropyrimidinones

, 2016
Combinatorial Synthesis of 2-Thioxo-4 ...
Cheng Leng Lee (3030528), Mui Mui Sim (3030531), Arasu Ganesan (3040221)   +2 more
core   +1 more source

Pivalic acid assisted Biginelli reaction for synthesis of dihydropyrimidinones and dihydrothiopyrimidinones [PDF]

, 2020
677-681Herein is provided an alternate, simple, multigram scale, efficient route for Biginelli reaction for synthesis of dihydropyrimidinones using urea, ethylacetatoacetate, and benzaldehyde with pivalic ...
Mhaldar, Shashank N, Chodankar, Anika Arjun, Gawas, Anushri Laxman, Anvekar, Tushar S, Salgaonkar, Lalitprabha N, Vernekar, Shruti Sagun, Vaz, Teotone, Kadam, Hari K, Gaonkar, Saurabh Sudan   +8 more
core  

Lanthanide Triflate Catalyzed Biginelli Reaction. One-Pot Synthesis of Dihydropyrimidinones under Solvent-Free Conditions

, 2016
Lanthanide Triflate Catalyzed Biginelli Reaction.
Limin Wang (87511), Min Yang (146229), Yun Ma (119475), Changtao Qian (2641480)   +3 more
core   +1 more source

Evaluation of Uliginosin B as a Modulator of the Ras Pathway: In Vivo Evidence From Caenorhabditis elegans and In Silico Insights

Chemistry &Biodiversity, Volume 23, Issue 8, August 2026.
This study performs in vivo and in silico assays with uliginosin B, targeting its activity in the Ras signaling pathway, demonstrating a possible allosteric interaction with the HRAS (human) and LET‐60 (nematode) proteins, and a decrease in the overexpression of the let‐60 gene in the nematode C. elegans.
Maria Eduarda O. De Souza, Flávia Suelen De O. Pereira, Daniela Teixeira Rodrigues, Helder Dias Costa, Tarsila Dantas Da Rosa, Camila Machado Pires da Silva, Gilsane von Poser, Stela M. K. Rates, Favero R. Paula, Daiana Silva Ávila   +9 more
wiley   +1 more source