Results 101 to 110 of about 4,540 (259)
Multicomponent Biginelli's synthesis of 3,4-dihydropyrimidin-2(1H)-ones promoted by SnCl2.2H2O
Journal of the Brazilian Chemical Society, 2004 The ability of SnCl2.2H2O as catalyst to promote the Biginelli three-component condensation reaction from a diversity of aromatic aldehydes, ethyl acetoacetate and urea or thiourea is described.
Russowsky Dennis +5 more
doaj
Green Chemistry Letters and Reviews, 2018 We are reporting a simple, efficient and green protocol for the synthesis of chromenes and dihydropyrimidines (products of Knoevenagel and Biginelli reaction, respectively) by the use of silica-supported perchloric acid (HClO4–SiO2) as an effective ...
Leimajam Vartima Chanu +3 more
doaj +1 more source
Molecules, 2019 In our studies on the catalytic activity of Group IVB transition metal Lewis acids, Hf(OTf)4 was identified as a highly potent catalyst for „one-pot, three-component„ Biginelli reaction.
Rui Kong +6 more
doaj +1 more source
Chemoselective Protection and Deprotection of Aldehydes Using Solid Supported Reagent (Silica Chloride) under Solvent-Free Conditions [PDF]
, 2011 Silica chloride, a heterogeneous catalyst, has been found to be an efficient catalyst for the protection of aldehydes as acylals under solvent-free conditions, and deprotection of acylals to aldehydes in methanol as a solvent occurred. The reaction takes
Banditadatta, ., Pasha, M.A.
core +1 more source
Biomimetic Chiral Nanomaterials with Selective Catalysis Activity
Advanced Science, Volume 11, Issue 23, June 19, 2024.In this work, chiral nanomaterials synthesis, composition, and catalytic performances of different biochemical hybrid chiral nanomaterials are discussed. The construction of chiral nanomaterials with multiscale chiral geometries along with the underlying principles for enhancing chiroptical responses are highlighted.
Honghui Cao +4 more
wiley +1 more source
Sustainable Biginelli chemistry: Indian contributions to green multicomponent synthesis
Discover ChemistryThe Biginelli Reaction is a one-pot acid-catalysed cyclo-condensation procedure that combines urea, β-ketoester, and aromatic aldehydes to create functionalised DHPMs. For more than a century, this three-component reaction has been recognised as a method
Rajni +4 more
doaj +1 more source
Methyl 6-Methyl-1-(4-methylphenyl)-2-oxo-4-phenyl-1,2,3,4-tetrahydropyrimidine-5-carboxylate
Molbank, 2012 Methyl 6-methyl-1-(4-methylphenyl)-2-oxo-4-phenyl-1,2,3,4-tetrahydro-pyrimidine-5-carboxylate has been synthesized via the modified Biginelli reaction from benzaldehyde, p-tolylurea, and methyl acetoacetate, promoted with microwave irradiation and ...
Haiping Wang, Qing Chen, Qingjian Liu
doaj +1 more source
A modular, one-pot, four-component synthesis of polysubstituted 1,3-oxazolidines [PDF]
, 2005 4 pages, 1 figure, 1 table, 1 scheme.-- PMID: 15675866 [PubMed].-- Printed version published Feb 4, 2005.Supporting information available: Spectroscopic and analytical data for compounds 3c-j.-- Available at: http://pubs.acs.org/doi/suppl/10.1021 ...
García-Tellado, Fernando +4 more
core +1 more source
SPECIFIC “IONIC LIQUIDS” AS NEW ORGANOCATALYSTS OF BIGINELLI REACTION [PDF]
Chemistry Journal of Moldova: General, Industrial and Ecological Chemistry, 2008 New ionic liquids bearing an imidazolium core with a carboxy group have been prepared in an attempt to design new organocatalysts of Biginelli reaction. Trends in the properties of these compounds are discussed.
Viorica Sargarovschi +2 more
doaj
Chemistry Journal of Moldova: General, Industrial and Ecological ChemistryThis study introduces an environmentally sustainable approach for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones (DHPMs), via the Biginelli reaction. A heterogeneous catalyst, Heteropolyacid-Clay (HPA-Clay), is developed by immobilizing H5PV2W10O40 on ...
Nuzhat Rehman +6 more
doaj +1 more source