Efficient ball-mill procedure in the 'green' asymmetric aldol reaction .Sep 9, 2011 . The organocatalytic activity of (S)-proline-based dipeptides 1a–c has been evaluated in the asymmetric aldol reaction between representative ketones with various aromatic aldehydes under solvent-free conditions in a ball mill. In particular, the methyl ester of (S)-proline-(S)-tryptophan, (S,S)-1c, proved to.efficient ball mill procedure in the green asymmetric aldol reaction,Green and efficient technique for the three component synthesis of .1. Green and efficient technique for the three component synthesis of. 2-aminothiophenes using ball-milling method through Gewald reaction. Mohamed Ould . Suzoku-type reaction , synthesis of functionalized indan-1,3-diones , aldol reaction . General Procedure for the Synthesis of Pyridine Compound 3a.
Comments About efficient ball mill procedure in the green asymmetric aldol reaction
José G. Hernández (0000-0001-9064-4456) - ORCID | Connecting .
Synthesis of 3-Iodobenzofurans by Electrophilic Cyclization under Solventless Conditions in a Ball Mill European Journal of Organic Chemistry. 2018-02 ... Efficient ball-mill procedure in the 'green' asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water Tetrahedron.
Product 32 - 71 . Mukaiyama-aldol reaction  gave a definitive impulse of the catalytic enantioselective version  of . The first solvent-free intermolecular aldol reaction involved the use of a ball mill . .. 1464-1467; (b) Hernández, J. G.; Juaristi, E. Efficient ball-mill procedure in the ‗green' asymmetric aldol reaction.
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Green and efficient technique for the three component synthesis of .
1. Green and efficient technique for the three component synthesis of. 2-aminothiophenes using ball-milling method through Gewald reaction. Mohamed Ould . Suzoku-type reaction , synthesis of functionalized indan-1,3-diones , aldol reaction . General Procedure for the Synthesis of Pyridine Compound 3a.
Fast, solvent-free and highly enantioselective fluorination of β-keto .
Mar 10, 2017 . As a mechanochemical technique, ball milling is an efficient and powerful tool in promoting reactions under solvent-free conditions. In the past decade, a series of asymmetric organocatalytic reactions have been developed using ball milling, such as asymmetric anhydride opening reactions, aldol reaction,.
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A highly efficient asymmetric organocatalytic aldol reaction in a ball .
Chemistry. 2007;13(17):4710-22. A highly efficient asymmetric organocatalytic aldol reaction in a ball mill. Rodríguez B(1), Bruckmann A, Bolm C. Author information: (1)Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany. Anti-aldol products with up to >99 % enantiomeric.
Natural low-molecular mass organic compounds with oxidase .
Nov 19, 2014 . Hernández JG, Juaristi E. Efficient ball-mill procedure in the 'green' asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water. Tetrahedron. 2011;67(36):6953–6959. 12. Fukatsu H, Hashimoto Y, Goda M, Higashibata H, Kobayashi M. Amine-synthesizing.
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Asymmetric organocatalysis in a ball mill – Beilstein TV
Aug 20, 2013 . In this video the authors present asymmetric organocatalyses performed in a ball mill. Three reaction types are being discussed: enantioselective aldol reactions, asymmetric Michael additions to nitro alkenes and dipeptide formations. In the laboratory the ball milling device is shown, and reaction details.
Molecules | Free Full-Text | An Increased Understanding of Enolate .
Apr 27, 2017 . Given the propensity of enolates to form aldol condensations products very rapidly under milling conditions, we conducted all subsequent enolate addition reactions in one-step instead of the two-step process traditionally executed in solution. With a clearer understanding of the reactivity trends of enolates.
Development in Organocatalysis – The Green . - ResearchGate
Jan 20, 2017 . give selectively the anti-aldol diastereomeric products in high yields and with up to 99% enantiomeric excess  (Scheme 11). Scheme 11. Solvent-Free Asymmetric. Organocatalyzed aldol reaction in a Ball Mill. In this study, Bolm and co-workers [70-72] demonstrated that the efficiency of the process.
and Intramolecular Aldol Reaction Employing L-Prolinamides - RUA
1-aminoindane, are evaluated as promoters in the direct asymmetric aldol reaction between ketones and aromatic .. nitrobenzoic acid (20 mol%) as the most efficient cocatalyst for the process in the presence of water. . efficacy of catalyst 1d was similar when the reaction was performed in a ball mill[9a,9b] (Table 1,.
Mechanochemically synthesized LiAlO catalyst for aqueous aldol .
Nov 23, 2017 . efficient, eco-friendly and recyclable water-tolerant solid .. with steel milling bodies (balls) at room temperature . reaction products. Aldol condensation of furfural with acetone was carried out in a 250 cm3 batch-type glass reactor equipped with a reflux condenser, thermometer and magnetic stirrer. The.
Dr Eusebio Juaristi Areas de Investigacion
(29) J.G. Hernández y E. Juaristi, “Efficient Ball-Mill Procedure in the “Green” Asymmetric Aldol Reaction Organocatalyzed by (S)-Proline-Containing Dipeptides in the Presence of Water”, Tetrahedron, 67, 6953-6959 (2011). (30) M. Escudero-Casao y E. Juaristi, “Asymmetric Synthesis of 2-homo-tert-leucine mediated via.
Academic Sciences - International Journal of Pharmacy and .
Aug 18, 2013 . balls. This mechanical energy is used to provide threshold energy for chemical reactions . In an example of application of ball mill, the two components of an aldol reaction are combined together with the asymmetric catalyst S- proline in a ball mill in a mechanosynthesis. The reaction product has.
Reacciones asimétricas organocatalizadas en ausencia de disolvente
28 Ene 2013 . ABSTRACT (Solvent-free asymmetric organocatalyzed reactions: a strategy towards a greener organocatalysis). According with the . KEYWORDS: Asymmetric organocatalysis, green chemistry, solvent-free reactions, ball-milling ... Hernández, J. G., Juaristi, E., Efficient ball-mill procedure in the 'green'.
Green Organocatalyst Reaction | Catalysis | Chemical Reactions
One of the most studied processes is the direct intermolecular asymmetric aldol condensation catalysed by proline 32 and primary amines, 33 which generally uses DMSO as solvent. The same reaction has been demonstrated to also occur using mechanochemical techniques, under solvent-free ball-milling condi- tions. 34
Chemical synthesis of lactic acid from cellulose catalysed by lead(II .
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Solvent-Free Henry and Michael Reactions with Nitroalkanes .
May 21, 2017 . In the case of the nitroaldol reaction, the main side product is the formation of the nitroalkene through a further condensation reaction of the nitroalcohol. In some cases the use of certain catalysts resulted in the production of a conjugated enone through an aldol condensation side reaction, whereas some.
Download (6MB) - MMU e-space - Manchester Metropolitan University
ball mill and microwave assisted synthesis of fluoxetine and duloxetine and ... Catalytic asymmetric addition of organolithium reagents to ... processes. For this reason, pharmaceutical industry aims to reduce the amount of solvent used in every process. Ideally, the best situation would be a reaction in which no solvent is.
Porous cellulose aerogels with high mechanical performance and .
Two different raw materials including MCC and DMCC obtained by shredding, grinding and ball-milling of pulp board were used to prepare cellulose alcogel ... “Chitosan aerogel: A recyclable, heterogeneous organocatalyst for the asymmetric direct aldol reaction in water,” Chemical Communications 46(34), 6288-6290.
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Jun 15, 2017 . Changes made as a result of publishing processes such as copy-editing, formatting and page numbers may not be . both the Henry and the Michael reactions with nitrocompounds. he application of this catalyst under environmentally friendly . through an aldol condensation side reaction, whereas some.