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  • ChemInform Abstract: Efficient Ball-Mill Procedure in the

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  • Efficient ball-mill procedure in the ‘green’ asymmetric

    Efficient ball-mill procedure in the ‘green’ asymmetric aldol reaction organocatalyzed by (S) In our previous work, we also evaluated dipeptide (S,S)-1a as catalyst in the asymmetric aldol reaction between acetone and 4-nitrobenzaldehyde under H conditions.

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  • Efficient ball-mill procedure in the ‘green’ asymmetric

    Efficient ball-mill procedure in the ‘green’ asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water Author links open overlay panel José G. Hernández Eusebio Juaristi

  • Cited by: 115
  • Efficient Ball Mill Procedure In The Aldol Reaction

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  • A Green and Efficient Asymmetric Aldol Reaction Catalyzed

    Jun 22, 2010· A chiral anion modified ionic liquid derived from L ‐proline proves as a green and efficient asymmetric organocatalyst for direct asymmetric aldol reactions in [BMIm]BF 4 at room temperature. The corresponding aldol products with moderate to good isolated yields (up to 99 %), anti ‐diastereoselectivities (up to 97:3), and excellent

  • Polymer‐Immobilized Pyrrolidine‐Based Chiral Ionic Liquids

    Department of Chemistry, Huaibei Coal Teachers College, Huaibei, Anhui 235000, P. R. China, Fax: +86‐561‐3090‐518. Search for more papers by this author

  • (PDF) A Review on Aldol Reaction ResearchGate

    A Review on Aldol Reaction. improvised variations as far as th eir efficiency is concerned. Since green chemistry . asymmetric aldol reaction of acetone with aromatic aldehydes, using zinc

  • ball milling asymmetric organocatalysis

    An efficient solvent-free ball-milling protocol for the asymmetric aldol reaction between cyclohexanone and cyclopentanone with various aromatic aldehydes using a novel series of (S)-proline-containing dipeptides and thiodipeptides 1a–f as organocatalysts is reported general (S)-proline-containing thiodipeptides proved to be better

  • The Ion Tag Strategy as a Route to Highly Efficient

    Arturo Obregón‐Zúñiga, Marco Guerrero‐Robles and Eusebio Juaristi, Chiral Imidazolium Ionic Liquids Derived from (S)‐Prolinamine as Organocatalysts in the Asymmetric Michael Reaction and Michael‐Aldol Cascade Reaction under Solvent‐Free Conditions, European Journal of Organic Chemistry, 2017, 19, (2692-2697), (2017).

  • Highly Efficient Small Organic Molecules for

    May 07, 2009· 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.

  • 10.1016/j.tet.2011.06.042 DeepDyve

    Jun 11, 2020· The desired aldol products were obtained in high yields (up to 94%) and good enantioselectivities (up to 97% ee). 17a In addition, Li and co-workers examined dipeptide ( 1c -OH) in the asymmetric aldol reaction of different ketones and aldehydes in solid phase media (Al 2 O 3 ), using 1,4-diazabicyclo[2.2.2]octane as additive, observing

  • Highly Enantioselective Aldol Reactions Catalyzed by a

    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. DOI: 10.1016/j.tet.2011.06.042.

  • efficient for ball mill

    Difference Between Sag Mill vs Ball Mill mech4study. 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 be an efficient organocatalyst

  • Synthesis of 1,2-Diamine Bifunctional Catalysts for the

    Title:Synthesis of 1,2-Diamine Bifunctional Catalysts for the Direct Aldol Reaction Through Probing the Remote Amide Hydrogen VOLUME: 6 ISSUE: 2 Author(s):Rajasekhar Dodda, Sampak Samanta, Matthew Su and John Cong-Gui Zhao* Affiliation:Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, Department of Chemistry, University of

  • Water versus Solvent-free Conditions for the

    reaction times and result in simple and efficient workup procedures.[9] For these reasons, organocatalyzed aldol reactions under solvent-free conditions or employing water as solvent have become a highly pursued goal in green chemistry. Following our studies in the use of prolineamide-derived organocatalysts as efficient

  • Natural low-molecular mass organic compounds with oxidase

    Dec 02, 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.

  • Hydrolase-Catalyzed Promiscuous Reactions and Applications

    Our group reported the first lipase-catalyzed asymmetric aldol reaction in 2008 . However, these aldol reactions in earlier studies involving hydrolases just showed moderate activities and selectivities; some more efficient promiscuous aldol reaction have been researched and presented in the last decade.

  • efficient ball mill in pakistan concreetbegeleiding

    efficient ball mill in pakistan. Pakistan Ball Mill Pakistan Ball Mill Suppliers and Features of ball mill 1 is an efficient tool for grinding many materials into fine powder 2 The ball mill is used to grind many kinds of mine and other materials or to select the mine 3 Ball mill is widely used in building material and chemical industry.

  • Mechanochemistry assisted asymmetric organocatalysis: A

    Aldol reaction. Since the origin of organocatalysis, the asymmetric aldol reaction has been one of the most intensely studied reactions, providing an easy access to chiral β-hydroxycarbonyl compounds, which are important building blocks for various bioactive molecules [].Among different organocatalysts used for asymmetric aldol reactions, proline and its derivatives emerged as powerful

  • ball milling asymmetric organocatalysis

    Efficient Ball Mill Procedure In The Green Asymmetric . Ball Mill Reactions. Read "solventfree asymmetric organocatalysis in a ball mill" on deepdyveinstant access to the journals you need more efficient ball-mill procedure in the green efficient ball-mill procedure in the green asymmetric aldol reaction organocatalyzed by s. Service Online

  • Recent efforts directed to the development of more

    For example, in the asymmetric aldol reaction organocatalyzed by L-proline reported by List and Barbas et al. 1a in addition to the remarkable novelty of constituting “ the first example of a nonmetallic small-molecule catalyst for direct intermolecular asymmetric aldol reactions ”, 1a this development can also be classified as a “green

  • Earthworms as a Biocatalyst: In Asymmetric Aldol Reactions

    The asymmetric direct aldol reaction as one of the most powerful carbon-carbon bond formation methods has become one of the central study issues in organic synthesis. 11 In recent years, a lot of successful metal catalysts and organocatalysts for direct asymmetric aldol reactions have been reported with high efficiency and enantioselectivity

  • Ball Milling Asymmetric Organocatalysis

    Efficient ball mill procedure in the green asymmetric. Efficient ball mill procedure in the green asymmetric aldol reaction solvent free asymmetric aldol reaction organocatalyzed by sefficient ball mill procedure in the green asymmetric aldol reaction an efficient solvent free ball milling protocol for

  • Asymmetric Catalysis Home ICM

    [23] Hernández J.G., Juaristi E., Efficient ball-mill procedure inthe ‘green’ asymmetric aldol reaction organocatalyzed by(S)-proline-containing dipeptides in the presence of

  • ball milling asymmetric organocatalysis

    Efficient Ball Mill Procedure In The Green Asymmetric . Ball Mill Reactions. Read "solventfree asymmetric organocatalysis in a ball mill" on deepdyveinstant access to the journals you need more efficient ball-mill procedure in the green efficient ball-mill procedure in the green asymmetric aldol reaction organocatalyzed by s. Service Online

  • efficient for ball mill

    Difference Between Sag Mill vs Ball Mill mech4study. 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 be an efficient organocatalyst

  • efficient ball mill in pakistan concreetbegeleiding

    efficient ball mill in pakistan. Pakistan Ball Mill Pakistan Ball Mill Suppliers and Features of ball mill 1 is an efficient tool for grinding many materials into fine powder 2 The ball mill is used to grind many kinds of mine and other materials or to select the mine 3 Ball mill is widely used in building material and chemical industry.

  • Ball Milling Asymmetric Organocatalysis

    Efficient ball mill procedure in the green asymmetric. Efficient ball mill procedure in the green asymmetric aldol reaction solvent free asymmetric aldol reaction organocatalyzed by sefficient ball mill procedure in the green asymmetric aldol reaction an efficient solvent free ball milling protocol for

  • Synthesis of 1,2-Diamine Bifunctional Catalysts for the

    Title:Synthesis of 1,2-Diamine Bifunctional Catalysts for the Direct Aldol Reaction Through Probing the Remote Amide Hydrogen VOLUME: 6 ISSUE: 2 Author(s):Rajasekhar Dodda, Sampak Samanta, Matthew Su and John Cong-Gui Zhao* Affiliation:Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, Department of Chemistry, University of

  • Catalytic asymmetric synthesis of 3-hydroxyoxindole : a

    Recently, Juaristi et al. 10 developed a solvent-free high speed ball-milling procedure for direct asymmetric aldol reaction of acetone to isatins (2) using thio-dipeptides as organocatalysts. The thio- peptide 4 catalyzed the formation of 3-acetonyl-3-hydroxy-2-oxindoles ( 3 ) in moderate yield (54–68%) and moderate to good

  • Water versus Solvent-free Conditions for the

    reaction times and result in simple and efficient workup procedures.[9] For these reasons, organocatalyzed aldol reactions under solvent-free conditions or employing water as solvent have become a highly pursued goal in green chemistry. Following our studies in the use of prolineamide-derived organocatalysts as efficient

  • Towards the development of continuous, organocatalytic

    Different deep eutectic solvent (DES) mixtures were studied as reaction media for the continuous synthesis of enantiomerically enriched products by testing different experimental set-ups. L-Proline-catalysed cross-aldol reactions were efficiently performed in continuo, with high yield (99%), anti-stereoselectivity, and enantioselectivity (up to

  • Mechanochemistry assisted asymmetric organocatalysis: A

    Oct 19, 2012· Aldol reaction. Since the origin of organocatalysis, the asymmetric aldol reaction has been one of the most intensely studied reactions, providing an easy access to chiral β-hydroxycarbonyl compounds, which are important building blocks for various bioactive molecules .Among different organocatalysts used for asymmetric aldol reactions, proline and its derivatives emerged as powerful

  • Study 1,362 Terms Chemistry Flashcards Quizlet

    Giving the same products as the Peterson reaction, unlike the Knoevenagel and aldol reactions, it is stereoselective and regiospecific. Beta-carotene is synthesized from vitamin A using this reaction in which an aldehyde or ketone reacts with a phosphonium ylide to form an alkene.

  • ChemCatChem: Vol 5, No 10 Chemistry Europe

    The asymmetric aldol reaction between cyclohexanone and benzaldehyde in the presence of tagged 4‐hydroxy‐prolines is modeled to elucidate the empirical concept of electrosteric activation, introduced to account for the much higher activity of cis ‐ion‐tagged prolines. A complex interplay of hydrogen bonds and π‐stacking interactions

  • Asymmetric Catalysis Home ICM

    [23] Hernández J.G., Juaristi E., Efficient ball-mill procedure inthe ‘green’ asymmetric aldol reaction organocatalyzed by(S)-proline-containing dipeptides in the presence of

  • José G. Hernández Research Assistant RWTH Aachen

    Efficient Ball-Mill Procedure in the “Green” Asymmetric Aldol Reaction Organocatalyzed by (S)-Proline-Containing Dipeptides in the Presence of Water Tetrahedron Sep. 2011 The organocatalytic activity of (S)-proline-based dipeptides 1a–c has been evaluated in the asymmetric aldol reaction between representative ketones with various

  • Clean and Efficient One-Pot Synthesis of New 2-Oxo-2,3

    Oct 11, 2015· Rodriguez B, Bruckmann A, Bolm C.A Highly Efficient Asymmetric OrganocatalyticAldol Reaction in a Ball Mill.ChemEurJ2007; 13: 4710-4722. Hernandez J G, Juaristi E. Efficient ball-mill procedure in the ‘green’ asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water. Tetrahedron2011; 67: 6953-6959.