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Efficient Ball Mill Procedure In The Green Asymmetric Aldol Reaction

  • Supporting Information for

    Typical experimental procedure for the solvent free aldol reaction performed in the ball mill A ball mill vessel was charged with cyclohexanone 67 mL 0.65 mmol p nitrobenzaldehyde 89 mg 0.59 mmol 1b 40 mg 0.059 mmol and 2 balls Stirring was started in a grinding bowl using the ball mill with a frecuency of 30 s 1.

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  • Natural low molecular mass organic compounds with

    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.

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  • PDF e EROS Encyclopedia of Reagents for Organic

    The catalytic complex obtained by reaction with titanium tetra isopropoxide gave the O TMS cyanohydrin with 47 yield and 33 ee Better results up to

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  • Synthesis and Reactions of Hydroxyphosphonates

    environmentally friendly approaches green activation methods such as microwave MW irradiation 30 31 and grinding 32 33 were also employed in the synthesis of hydroxyphosphonates 1 According to a MW assisted procedure the reaction of benzaldehydes and

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  • green aldol ndensation by ball mill method

    Efficient Ball Mill Procedure In The Green Asymmetric Aldol Reaction the organocatalytic activity of the methyl ester of s proline s phenylalanine s s 2 in the asymmetric aldol reaction between cyclohexanone and acetone with various aromatic aldehydes under solvent free conditions in a ball mill has been evaluated dipeptide s s 2

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  • Homochiral bifunctional L ‐prolinamide‐ and L‐ bis

    ChemInform Abstract Efficient Ball Mill Procedure in the ′Green′ Asymmetric Aldol Reaction Organocatalyzed by S Proline Containing Dipeptides in the Presence of Water Article Sep 2011

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  • Organocatalysis in aqueous media Nature Reviews

    In terms of aqueous reactions catalysts that activate a carbonyl substrate to form an enamine and iminium typically as part of an overall asymmetric aldol reaction have received the most

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  • X MOL

    IF 4.45 4 An Organocatalytic Domino Thia Michael/Aldol Condensation Reaction Highly Enantioselective Synthesis of Functionalized Dihydrothiophenes Adv Synth Catal 2010 352 2121 IF 6.048 5 Fast solvent free and hydrogen bonding mediated asymmetric Michael addition in a ball mill Green Chem 2012 14 4 893.

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  • Publications 1994 PresentStanford University

    Present 1994 1000 Trost B M Huang Z Catalytic 3 2 Palladium Aminoallyl Cycloaddition with Conjugated Dienes Angew

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  • Click Chemistry

    Click Chemistry Azide Alkyne Cycloaddition Click Chemistry is a term that was introduced by K B Sharpless in 2001 to describe reactions that are high yielding wide in scope create only byproducts that can be removed without chromatography are stereospecific simple to perform and can be conducted in easily removable or benign solvents.

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  • Influence of the milling parameters on the mechanical

    1 Influence of the milling parameters on the mechanical work intensity in planetary mills F J Gotor 1 M Achimovicova 2 C Real 1 and P Balaz 2 1Instituto de Ciencia de Materiales de Sevilla CSIC US Américo Vespucio 49 41092 Sevilla SPAIN 2Institute o f Geotechnics Slovak Academy of Sciences Watsonova 45 043 53 Košice

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  • Thieme E JournalsSynlett Abstract

    12 General procedure for cooperative chiral guanidine/AgPF 6 catalyzed asymmetric isocyanoacetate aldol reaction with isatins To a stirred mixture of isocyanoacetate 1 0.12 mmol 2 MeOC 6 H 4 CO 2 H 10 mol 4a 10 mol and AgPF 6 11 mol in THF 0.5 mL was added isatin 2 0.1 mmol and THF 0.5 mL at 0 °C The reaction was then

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  • Efficient ball mill procedure in the green asymmetric

    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 and the aldol reaction proceeded with good chemical

    Cited by 100

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  • 10.1016/j.tet.2011.06.042 10.1016/j.tet.2011 DeepDyve

    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

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  • Organocatalytic solvent free hydrogen bonding mediated

    An efficient solvent free protocol for asymmetric Michael additions of α nitrocyclohexanone to nitroalkenes using thiourea derivatives as hydrogen bonding catalysts has been developed By performing the organocatalytic reactions in a planetary ball mill

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  • Substituted arene synthesis by alkylation or arylation

    L T Ball M Green G C Lloyd Jones C A Russel Org Lett 2010 12 A well defined cationic Ru H complex catalyzes the dehydrative C H alkylation reaction of phenols with alcohols to form ortho substituted phenol products The reaction with diols delivers benzofuran derivatives via dehydrative C H alkenylation and annulation

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  • Development and Application of Efficient Ag‐based

    The selective hydrogenation of nitro groups is an important reaction as it has found many applications in industry and academia since the first industrial application was reported by Béchamp more than 150 years ago 16 Starting from this non catalytic approach the use of hydrogen as reducing agent rapidly became the method of choice Numerous homogenous as well as heterogenous metal

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  • KF/Nano clinoptilolite Catalyzed Aldol Type Reaction of

    Potassium hydroxide shows better catalytic performance at shorter reaction time than other bases such as NaOH K 2 CO 3 and Na 2 CO 3 Table 1 entries 1–4 .Potassium fluoride alone afforded only low yield of product 3a Table 1 entry 5 .The reaction mediated clinoptilolite afforded less than 5 of desired product Table 1 entry 6 .Potassium fluoride supported on clinoptilolite afforded

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  • Mechanochemical 1 1 Carbonyldiimidazole Mediated

    Table 1 Reaction Scope for the One Pot/Two Step Preparation of N O Disubstituted Carbamates in a Vibrational Ball Milla b aTypical procedure using 5 mL stainless steel jar 2 stainless steel balls 5 mm diameter in a vibrational ball mill at 30 Hz step 1 alcohol 0.58

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  • Ball MillingUniversity of Massachusetts Boston

    Ball Milling An efficient and ecologically friendly synthetic approach ‐‐‐ Jackie Ding Ball millingsolvent free approach Application in organic synthesis Conclusion Content 2 The 12 Principles of Green Chemistry Planetary Ball Mill PM 400 Feed material soft hard

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  • A more sustainable and efficient access to IMesHCl and

    1 A more sustainable and efficient access to IMes HCl and IPr HCl by ball milling Audrey Beillard a Xavier Bantreil a Thomas Xavier Métro a Jean Martineza and Frédéric Lamaty a a Institut des Biomolécules Max Mousseron IBMM UMR 5247 CNRS Université de

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  • Efficient ball mill procedure in the green asymmetric

    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 and the aldol reaction proceeded with good chemical

    Cited by 100

    Get Price
  • ChemInform Abstract Efficient Ball Mill Procedure in the

    ChemInform Abstract Efficient Ball Mill Procedure in the ′Green′ Asymmetric Aldol Reaction Organocatalyzed by S Proline Containing Dipeptides in the Presence of Water.

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  • Mechanochemistry assisted asymmetric organocatalysis

    Scheme 4 Asymmetric aldol reaction assisted by ball milling catalysed by dipeptides A with III and B with IV The methyl ester of S proline S tryptophan IV was shown to be an efficient organocatalyst for asymmetric aldol reactions of ketones with aromatic aldehydes in the presence of water by using HSBM Scheme€4 37 .

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  • A green look at the aldol reactionGreen Chemistry RSC

    Introduction The aldol reaction is one of the most powerful and best known C–C forming synthetic reactions universally present in basic and advanced organic chemistry texts and amply reviewed in organic synthetic books and series 1–4 The reaction has industrial relevance either in bulk production or in the fine chemical and pharmaceutical industry 5 The aldol reaction has a particular

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  • Fast solvent free and hydrogen bonding mediated

    The chiral squaramide derivatives as hydrogen bonding catalyst for the Michael addition reactions of 1 3 dicarbonyl compounds to nitroolefins under solvent free conditions was developed using a planetary ball mill High yields high enantioselectivities and shorter reaction times were achieved with low catal

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  • Peanut shell as a green biomolecule support for anchoring

    Green chemistry is one of the most important research activities for chemists both in the laboratory and industry Therefore many efficient eco friendly and clean synthetic strategies have been developed for the synthesis of biologically and industrially active molecules 1 2 3 4 5 .Meanwhile metal catalyzed multi component reaction is one of the significant areas of green chemistry research.

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  • A Review on Solvent free Methods in Organic Synthesis

    Therefore the key factor of the green synthetic approach is to utilize renewable materials nontoxic chemical and to perform the reactions under solvent free conditions In this review we have discussed most recent literature survey on applications of solvent free techniques in organic synthesis which would offer a new opportunity to a

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  • Recent Strategies in the Synthesis of Spiroindole and

    After the aldol procedure in a one pot process substrate 110 could be readily involved with three equivalents of NCS and converted to dearomatizated product 111 in 76 efficiency and 94 ee Furthermore high diastereoselectivity was acquired due to the steric strain of

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  • Highly Efficient Small Organic Molecules for

    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 DOI 10.1016/j.tet.2011.06.042.

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  • Ball Milling Towards Green Synthesis Applications

    Chapter 1 Carbon Heteroatom Bond Forming Reactions and Heterocycle Synthesis under Ball Milling by Brindaban C Ranu Tanmay Chatterjee and Nirmalya Mukherjee Indian Association for the Cultivation of Science India covers carbon–heteroatom C–N C–O C–S C–Cl C–Br bond formation and synthesis of heterocycles under ball

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  • A highly efficient asymmetric organocatalytic aldol

    Anti aldol products with up to >99 enantiomeric excess ee have been obtained by proline catalysis in excellent yields under experimentally simple solvent free conditions Efficient mixing of all the components is accomplished by applying a mechanochemical technique ball milling The catalysis is air and moisture tolerant and can be performed with non purified starting materials.

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  • Solvent free enantioselective organocatalyzed aldol

    solvent media The first solvent free intermolecular aldol reaction involved the use of a ball mill 22 This technique 23 is widely applied in grinding minerals and solids into fine particles and it was used in this transformation in order to enhance the efficient mixing of

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  • Recent efforts directed to the development of more

    Pioneers in this field Bolm et al reported that the asymmetric aldol reaction under solvent free conditions and catalyzed by S proline 10 mol in a ball mill employing a 1.1 1 ketone/aldehyde ratio proceeded efficiently to give selectively the anti aldol diastereomeric products in high yields and with up to 99 enantiomeric excess

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  • Organic synthesis by Twin Screw Extrusion TSE

    diverse range of organic reactions has been demonstrated mainly through ball milling 12 In particular several successful mechanochemical condensation reactions have been reported including the Knoevenagel condensation and Aldol 8 9 17 10 reaction Other examples of organic reactions performed mechanochemically

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  • Recent applications of organocatalysts in asymmetric aldol

    An efficient solvent free ball milling procedure for the asymmetric aldol reaction was described by Juaristi et al using a novel series of S proline containing dipeptides and thiodipeptides as organocatalysts 104 The best organocatalysts for the following reaction were thiodipeptides 96 Download Download full size image Scheme 79.

    Cited by 129

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  • Redox reactions of small organic molecules using ball

    Mixing solid reactants in a ball mill is a promising means of avoiding the copious solvent waste associated with most chemical syntheses et al now report that adding a piezoelectric catalyst to the mix can promote bond formation through apparent electron transfer cycles see the Perspective by Xia and Wang Specifically barium titanate activates aryl diazonium salts toward

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  • A Simple and Green Protocol for 2H Indazolo 2 1 b

    A robust facile and solvent free route for the three component synthesis of 2 H indazolo 2 1 b phthalazine triones in the presence of a catalytic amount of p toluene sulfonic acid utilizing grinding has been developed Short reaction time simple operation and high yields are the advantages of this protocol.

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  • Chapter Recent Advances in Mechanochemical Organic

    reactions when solution procedure was replaced by solvent free conditions Figure 6 39 Whereas in solution 3 hydroxy 1 3 diphenylbutan 1 one and dypnone were formed by base catalyzed aldol condensation of acetophenone in ball mill Figure 3 Cyclopropenation of alkenes and alkynes with diazoacetates Figure 4.

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  • Solvent Free Mechanochemical Deprotection of N Boc

    A novel simple solvent free synthetic procedure for N Boc removal in ball mill in very mild reaction conditions at room temperature is described This method has potential application in Boc group deprotection of other types of amines in various fields such as synthesis of pharmaceutically interesting molecules natural product synthesis or

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