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Biginelli Reaction (biginelli + reaction)
Selected AbstractsHighly Enantioselective Biginelli Reaction Promoted by Chiral Bifunctional Primary Amine-Thiourea Catalysts: Asymmetric Synthesis of DihydropyrimidinesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 18 2009Yangyun Wang Abstract The diastereospecific formation of dihydropyrimidines (DHPMs) has been achieved in moderate to high yields with up to 99% ee by a Biginelli reaction. The reaction was performed by using a combined catalyst consisting of a chiral bifunctional primary amine-thiourea 9f and a Brønsted acid with tert -butylammonium trifluoroacetate (t- BuNH2,TFA) as additive in dichloromethane at room temperature. The possible mechanism for the reaction has been proposed to explain the origin of the activation and the asymmetric induction. [source] ChemInform Abstract: Imidazolium Salts with a Free Carboxy Group as New Catalysts of the Biginelli Reaction.CHEMINFORM, Issue 41 2010F. Makaev No abstract is available for this article. [source] ChemInform Abstract: Chemo-/Regioselective Synthesis of 6-Unsubstituted Dihydropyrimidinones, 1,3-Thiazines and Chromones via Novel Variants of Biginelli Reaction.CHEMINFORM, Issue 37 2009Jie-Ping Wan Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Calcium Fluoride: An Efficient and Reusable Catalyst for the Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones and Their Corresponding 2(1H)Thione: An Improved High-Yielding Protocol for the Biginelli Reaction.CHEMINFORM, Issue 34 2009S. Chitra Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Synthesis of Substituted 5-(Pyrrolidin-2-yl)tetrazoles and Their Application in the Asymmetric Biginelli Reaction.CHEMINFORM, Issue 25 2009Yong-Yong Wu Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Biginelli Reaction for Synthesis of Novel Trifluoromethyl Derivatives of Bis(tetrahydropyrimidinone)benzenes.CHEMINFORM, Issue 9 2009Javad Azizian Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Applications of Lanthanide Trichloride Hydrates, Prepared from Mischmetall, in the Biginelli Reaction.CHEMINFORM, Issue 21 2008Marie-Isabelle Lannou Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Biginelli Reaction in Aqueous Medium: A Greener and Sustainable Approach to Substituted 3,4-Dihydropyrimidin-2(1H)-ones.CHEMINFORM, Issue 4 2008Vivek Polshettiwar Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] An Efficient Two-Step Synthesis of 4-Methyl-1,2,3,5,6,10b-hexahydropyrimido[5,4-c]quinoline-2,5-diones via Biginelli Reaction.CHEMINFORM, Issue 34 2007Lhassane Ismaili Abstract ChemInform 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. [source] Phenylboronic Acid as a Mild and Efficient Catalyst for Biginelli Reaction.CHEMINFORM, Issue 47 2006Abdelmadjid Debache Abstract ChemInform 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. [source] PEG-SO3H as Catalyst for 3,4-Dihydropyrimidones via Biginelli Reaction under Microwave and Solvent-Free Conditions.CHEMINFORM, Issue 33 2006Xicun Wang Abstract ChemInform 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. [source] Copper Dipyridine Dichloride as a Mild and Efficient Catalyst for a One-Pot Condensation Biginelli Reaction.CHEMINFORM, Issue 48 2005V. Naveen Kumar No abstract is available for this article. [source] A Simplified Green Chemistry Approach to the Biginelli Reaction Using "Grindstone Chemistry".CHEMINFORM, Issue 7 2005Ajay K. Bose Abstract For Abstract see ChemInform Abstract in Full Text. [source] 2-Acylmethyl-1H-benzimidazoles in the Biginelli Reaction.CHEMINFORM, Issue 8 2004I. B. Dzvinchuk Abstract For Abstract see ChemInform Abstract in Full Text. [source] One-Pot Synthesis of Dihydropyrimidinones Catalyzed by Lithium Bromide: An Improved Procedure for the Biginelli Reaction.CHEMINFORM, Issue 26 2003Gourhari Maiti Abstract For Abstract see ChemInform Abstract in Full Text. [source] 2-Phenacylbenzothiazole in the Biginelli Reaction.CHEMINFORM, Issue 16 2003I. B. Dzvinchuk Abstract For Abstract see ChemInform Abstract in Full Text. [source] Bismuth Triflate Catalyzed One-Pot Synthesis of 3,4-Dihydropyrimidin-2-(1H)-ones: An Improved Protocol for the Biginelli Reaction.CHEMINFORM, Issue 15 2003Ravi Varala Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: Indium(III) Chloride-Catalyzed One-Pot Synthesis of Dihydropyrimidinones by a Three-Component Coupling of 1,3-Dicarbonyl Compounds, Aldehydes, and Urea: An Improved Procedure for the Biginelli Reaction.CHEMINFORM, Issue 5 2001Brindaban C. Ranu Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Ca(NO3)2·4H2O-catalysed Biginelli Reaction: One-pot Synthesis of 1,2,3,4-Tetrahydropyrimidin-2-ones/pyrimidine-2-thiones under Solvent-free ConditionsCHINESE JOURNAL OF CHEMISTRY, Issue 11 2008Abdelmadjid DEBACHE The synthesis of 1,2,3,4-dihydropyrimidinone/thione de- rivatives was achieved in good to excellent yields using calcium(II) nitrate as catalyst to promote the Biginelli three-component conden- sation reaction from a diversity of aromatic aldehydes, , -keto compounds and urea or thiourea. The reaction was carried out under solvent-free conditions. [source] Highly Enantioselective Biginelli Reaction Promoted by Chiral Bifunctional Primary Amine-Thiourea Catalysts: Asymmetric Synthesis of DihydropyrimidinesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 18 2009Yangyun Wang Abstract The diastereospecific formation of dihydropyrimidines (DHPMs) has been achieved in moderate to high yields with up to 99% ee by a Biginelli reaction. The reaction was performed by using a combined catalyst consisting of a chiral bifunctional primary amine-thiourea 9f and a Brønsted acid with tert -butylammonium trifluoroacetate (t- BuNH2,TFA) as additive in dichloromethane at room temperature. The possible mechanism for the reaction has been proposed to explain the origin of the activation and the asymmetric induction. [source] Biginelli-like three component reaction: Synthesis of some new ethyl 6-ethoxycarbonylmethyl-4-aryl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate derivativesJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2007Javad Azizian In the context of our high-throughput organic synthesis program, we have studied the reactivity of special ,-keto esters toward the Biginelli reaction. We have found that a diethyl-3-oxoglutarate reacts with one molecule of urea and one molecule of aldehyde under solvent-free conditions to give a new family of 3,4-dihydropyrimidin-2(1H)-ones in good yields. [source] A new biginelli reaction procedure using potassium hydrogen sulfate as the promoter for an efficient synthesis of 3,4-dihydropyrimidin-2(1H)-oneJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2004Shujiang Tu Simple and improved conditions have been found to carry out the Biginelli reaction for the synthesis of 3,4-dihydropyrimidin-2(1H)-one derivatives. This synthesis was performed using potassium hydrogen sulfate as the promoter in ethylene glycol solution. Compared with the classical Biginelli reaction conditions, this new method has the advantage of excellent yields (85,95%) and short reaction time (0.5,2 h). [source] ChemInform Abstract: Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones Using Ce(SO4)2,SiO2 as a Heterogeneous and Recyclable Catalyst.CHEMINFORM, Issue 40 2010Wen Pei Abstract Compared with the classical Biginelli reaction, the presented new method has the advantages of better product yields, short reaction time, easy separation and tolerance towards various functional groups. [source] One-pot Synthesis of Bis(dihydropyrimidinone-4-yl)benzene Using Boric Acid as a CatalystCHINESE JOURNAL OF CHEMISTRY, Issue 5 2005Tu Shu-Jiang Abstract A simple effective synthesis of bis(dihydropyrimidinone-4-yl)benzene derivatives, using boric acid as catalyst, from isophthalic aldehyde or terephthalic aldehyde, 1,3-dicarbonyl compounds and urea or thiourea in glacial acetic acid was described. As the expansion of the classical Biginelli reaction, this method has the advantage of excellent yields 83%,94% and short reaction time 0.5,1.5 h. [source] | ||||||||||