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. α,α-Dipeptide (S,S)-2 catalyzed the stereoselective formation of the expected aldol products, with higher diastereo- and ...

Efficient ball-mill procedure in the 'green' asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water Bookmark Download

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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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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

Degree of efficiency depending on type of ball mill and reaction scale. High energy efficiency compared to synthesis with other methods of energy entry (classical as well as non-classical) 6% 64% 94% 0% 25% 50% 75% 200 rpm 400 rpm 800 rpm chemical yield ball milling at different rot mortar + Figure 1 pestle Figure 2

Efficient ball-mill procedure in the 'green' asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water. Zinc mediated reductive dimerization and cyclization of α,β-unsaturated ketones in the presence of a catalytic amount of mercury(II) chloride.

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Three different methods are assayed: simple conventional magnetic stirring, magnetic stirring after previous dissolution in THF and evaporation, and ball mill technique. These procedures allow one to reduce not only the amount of required ketone to 2 equiv but also the reaction time to give the aldol products with regio-, diastereo-, and ...

Read "Efficient ball-mill procedure in the 'green' asymmetric aldol reaction organocatalyzed by ( S )-proline-containing dipeptides in the presence of water, Tetrahedron" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

A Highly Efficient Asymmetric Organocatalytic Aldol Reaction in a Ball Mill. Authors. Belén Rodríguez Dr., Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany, Fax: (+49) 241-809-2391 ...

Using a screening procedure involving a Clark-type oxygen electrode, ... (2011) 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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Efficient ball-mill procedure in the 'green' asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water José G. Hernández, Eusebio Juaristi Tetrahedron 2011,

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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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efficient organocatalyst studied promoting the direct aldol reaction of ... reaction times and result in simple and efficient workup procedures. .... efficacy of catalyst 1d was similar when the reaction was performed in a ball mill[9a,9b] (Table 1,.

José G. Hernández and Eusebio Juaristi, Efficient ball-mill procedure in the 'green' asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water, Tetrahedron, 67, 36, (6953), (2011).

Solvent-Free Henry and Michael Reactions with… efficient ball mill procedure in the green asymmetric aldol reaction. In the case of the Michael addition, the ...

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efficient ball mill procedure in the aldol reaction. Mar 10, 2017 High yields, high enantioselectivities and shorter reaction times As a mechanochemical technique, ball milling is an efficient and powerful tool in promoting reactions ball milling, such as asymmetric anhydride opening reactions, aldol . the substrate scope of this fluorination ...