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efficient ball mill procedure in the green asymmetric aldol reaction

Efficient ball-mill procedure in the ‘green’ asymmetric

网页2011-9-9  Efficient ball-mill procedure in the ‘green’ asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water Author

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Efficient ball-mill procedure in the 'green' asymmetric

网页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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ChemInform Abstract: Efficient Ball-Mill Procedure in the

网页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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10.1016/j.tet.2011.06.042 10.1016/j.tet.2011.06.042

网页2020-6-11  This simple new concept has totally captured the attention of much of the organic chemistry community in the last decade. 1 For instance, the fact that

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efficient ball mill procedure in the ‘green’ asymmetric aldol

网页Jul 16, , Abstract: BINAM-prolinamides are very efficient catalyst for the synthesis of , and N-benzyl isatin derivatives by using an aldol reaction between , of 3 equiv of nucleophiles

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Asymmetric Aldol Reaction Organocatalyzed by (S

网页2011-1-20  the organocatalytic activity of the methyl ester of ( s )-proline- ( s )-phenylalanine, ( s, s )- 2, in the asymmetric aldol reaction between cyclohexanone and

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efficient ball mill procedure in the aldol reaction - 金宝博官网

网页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

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efficient ball mill procedure in the green asymmetric aldol

网页9/9/2011 The organocatalytic activity of (S)-proline-based dipeptides 1a–c has been evaluated in the asymmetric aldol reaction between representative ketones with various

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efficient ball mill procedure in the aldol reaction

网页Organic chemists solved quickly the problem of pollutants by performing the reaction under solvent-free conditions. 7 A similar reaction performed under ball mill conditions gave the

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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. Authors: José G....

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Efficient ball-mill procedure in the ‘green’ asymmetric

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 yields and excellent diastereo- and enantioselectivity (up to 98:2 anti/syn dr and up to 98% ee), in the presence of water, and 5 mol % of benzoic acid as additive. Agid: 1094093

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efficient ball mill procedure in the ‘green’ asymmetric aldol

Enantioselective Solvent-Free Synthesis of 3-Alkyl-3-hydroxy Jul 16, , Abstract: BINAM-prolinamides are very efficient catalyst for the synthesis of , and N-benzyl isatin derivatives by using an aldol reaction between , of 3 equiv of nucleophiles and ball-mill stirring ( rpm) at −20 °C, , when the process was carried out under solvent-free conditions, the ,, Green Chem.

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efficient ball mill procedure in the aldol reaction - 金宝博官网

Efficient ball-mill procedure in the ‘green’ asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water. Tetrahedron 2011, DOI: 10.1016/j.tet.2011.06.042.

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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 ...

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A Simple and Efficient Protocol for Proline-Catalysed

The proline-catalysed asymmetric aldol reaction is usually carried out in highly dipolar aprotic solvents (dimethylsulfoxide, dimethylformamide, acetonitrile) where proline presents an acceptable solubility. Protic solvents are generally characterized by poor stereocontrol (e.g., methanol) or poor reactivity (e.g., water).

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Direct Asymmetric Aldol Reaction in Continuous Flow

2021-4-13  the basic approach of this work was to extend the successful results of the knoevenagel reaction in microfluidic reactor systems to the more complex asymmetric aldol reaction. 19 furthermore, a simple and inexpensive to manufacture organocatalyst should be immobilized within an mfr, which works reliably at room temperature without additives and

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Use of Prolyl Sulfonimidamides in Solvent-Free

2009-9-1  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 José G....

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Aldol condensation: green perspectives SpringerLink

2022-1-15  The method boasts of a green, inexpensive and efficient protocol for aldol reaction. Aqueous diethyl amine has also been proved successful for an efficient and green synthesis of dimedone-barbituric derivatives on Tandem–Michael aldol addition [ 37 ].

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efficient ball mill procedure in the aldol reaction

Organic chemists solved quickly the problem of pollutants by performing the reaction under solvent-free conditions. 7 A similar reaction performed under ball mill conditions gave the same aldol product 3a in 73% yield and 56% ee. 8 However, in this new protocol, the final work-up using a large amount of diethyl ether (about 80 mL mmol −1) returns us the initial problems

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Efficient ball-mill procedure in the 'green' asymmetric

网页Efficient ball-mill procedure in the ‘green’ asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water Jose G. Hern andez, Eusebio Juaristi * Departamento de Química, Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Apartado Postal 14e740, 07000 Mexico D.F ...

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efficient ball mill procedure in the ‘green’ asymmetric aldol

网页2009-5-7 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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efficient ball mill procedure in the green asymmetric aldol

网页José G. Hernández - Research Assistant - RWTH Aachen ... 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 ...

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efficient ball mill procedure in the green asymmetric aldol

网页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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efficient ball mill procedure in the green asymmetric aldol

网页Aldol reaction / Asymmetric organocatalysis / Water / Solvent-free reactions / Prolinethioamides reaction times and result in simple and efficient workup procedures. 9 For become a highly pursued goal in green chemistry. efficacy of catalyst 1d was similar when the reaction was performed in a ball mill 9a 9b (Table 1 .

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efficient ball mill procedure in the aldol reaction

网页Efficient ball-mill procedure in the ‘green’ asymmetric aldol. 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)

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A green look at the aldol reaction - Green

网页The study of the aldol reaction from the point of view of its greenness must have in mind first of all that a general synthetic method must be based on complete and efficient conversions of well defined selectivity and that

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indonesia efficient ball mill procedure in the green

网页asymmetric aldol reaction using immobilized proline on. Aug 22, 2005 José G. Hernández, Eusebio Juaristi,Efficient ball-mill procedure in the ‘green’asymmetric aldol reactionorganocatalyzed by (S)-proline-containing dipeptides in the presence of water, Tetrahedron, 10.1016/j.tet.2011.06.042, 67, 36, (6953-6959), (2011) Read More

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Highly Efficient Small Organic Molecules for

网页2009-5-7  The aldol products were obtained in high diastereoselectivities (up to 99:1) and enantioselectivities (up to >99% ee) for a broader range of substrates using 1 mol % of a catalyst. The results demonstrate that the structural features of organocatalysts play a crucial role in obtaining high optical purity of aldol adducts in an aqueous medium.

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The Ion Tag Strategy as a Route to Highly Efficient

网页The installation of an imidazolium tag viaacetate connection to the C‐4 of cis‐4‐hydroxy‐L‐proline provides a highly efficient catalyst for the direct asymmetric aldol reaction, that works in a remarkably low catalyst loading (0.1 mol%) affording TONs up to 930 in the case of electron‐poor aromatic aldehydes with eeup to >99%. Citing Literature

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