Results 131 to 140 of about 1,846 (154)

An Inexpensive Protocol for Biginelli Reaction

Synthetic Communications, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
A. Manjula, B. Vittal Rao, Parvathi Neelakantan   +2 more
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New catalysts of Biginelli reaction

Russian Journal of Organic Chemistry, 2007
A synthesis was developed of new imidazole derivatives catalyzing three-component condensation of ethyl acetoacetate, aromatic aldehydes, and urea(or thiourea) by Biginelli reaction.
F. Makaev, E. Styngach, V. Muntyanu, S. Pogrebnoi, Z. Rybkovskaya, A. Barba   +5 more
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The Biginelli Reaction

ChemInform, 2007
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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Aminoheterocycles as synthons for combinatorial Biginelli reactions

Molecular Diversity, 2010
Chlorotrimethylsilane (TMSCl) has been utilized as an efficient promoter and water scavenger in the synthesis of diverse dihydropyrimidines via Biginelli type MCR-heterocyclization using aminoheterocycles. High yields and a simple workup of target compounds enable the facile generation of combinatorial libraries comprising more than 2,000 compounds of ...
Sergey V, Ryabukhin, Andrey S, Plaskon, Sergey Yu, Boron, Dmitriy M, Volochnyuk, Andrey A, Tolmachev   +4 more
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Biginelli Reaction: A Green Perspective

Current Organic Chemistry, 2012
The Biginelli Reaction is a one-pot acid catalysed cyclocondensation of -keto ester, urea and aromatic aldehyde which leads to the synthesis of functionalised 3,4-dihydro-2(H)-pyrimidinones (DHPMs). This three-component reaction for the synthesis of dihydro- pyrimidinone and corresponding dihydropyrimidinethiones has now been known for more than a ...
Siva S. Panda, Pankaj Khanna, Leena Khanna   +2 more
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Biginelli Type Reaction with Tetroses Derivatives

HETEROCYCLES, 1988
Reaction de O-ethylidene-2,4 erythrose et -threose avec l'acetylacetate de methyle, l'uree et la thiouree; obtention principalement d'analogues de nucleosides ...
M. Valpuesta Fernández, F. J. L用ez Herrera, T. Lupi溶 Cobos   +2 more
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2-Acylthioacetamides in the Biginelli Reaction

Chemistry of Heterocyclic Compounds, 2014
We have demonstrated for the first time a Biginelli reaction of 2-acylthioacetamides with aromatic aldehydes and ureas or thioureas, leading to N-Ar1-4-Ar2-6-R1-1-R2-2-oxo(thioxo)-1,2,3,4-tetrahydro-pyrimidine-5-carbothioamides. The regioselectivity of this process matched the concept of hard/soft Lewis acids and bases.
M. N. Kurmach, A. B. Ryabitskiy, V. N. Britsun   +2 more
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Multicomponent Combinatorial Polymerization via the Biginelli Reaction

Journal of the American Chemical Society, 2016
A multicomponent combinatorial polymerization method has been exploited as a new intersection between combinatorial chemistry, polymer chemistry, and organic chemistry. The tricomponent Biginelli reaction has been employed as a model multicomponent reaction (MCR) to efficiently prepare a library of polycondensates with continuously changed chain ...
Haodong, Xue, Yuan, Zhao, Haibo, Wu, Zilin, Wang, Bin, Yang, Yen, Wei, Zhiming, Wang, Lei, Tao   +7 more
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Biginelli reaction starting directly from alcohols

Tetrahedron Letters, 2010
Abstract An efficient of one-pot oxidative access to 3,4-dihydropyrimidin-2-(1H)-ones directly from aromatic alcohols under mild conditions is reported. The protocol involves 1-methylimidazolium hydrogen sulphate [Hmim]HSO4 catalyzed oxidation of aromatic alcohols to aromatic aldehydes with NaNO3 followed by their cyclocondensation with 1,3 ...
null Garima, Vishnu P. Srivastava, Lal Dhar S. Yadav   +2 more
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Recent Advances in Biginelli-type Reactions

Current Organic Chemistry, 2020
The effective and high yielding synthesis of poly-functionalized pyrimidines, using multicomponent reactions (MCRs), is imperative in organic and medicinal chemistry. The classic Biginelli reaction is a typically one-pot three-component cyclocondensation reaction involving an aldehyde, a β-ketoester and urea, resulting in the construction of multi ...
Majid M. Heravi, Vahideh Zadsirjan
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