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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.
Efficient Ball Mill Procedure In The Green Asymmetric Aldol Reaction, Efficient ballmill procedure in the 'green' asymmetric aldol reaction The organocatalytic activity of (S)prolinebased dipeptides 1ac has been evaluated in the asymmetric aldol reaction between representative ketones with vari. Live Chat > The Aldol Reaction Chemistry. The ...
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Asymmetric organocatalysis in a ball mill – Beilstein TVAug 20, 2013 In this video the authors present asymmetric organocatalyses performed in a ball mill. Thr. ... T130X Superfine Grinding Mill Optimized, Accurate, Reliable, Efficient T130X Superfine Grinding Mill evolves from TGM Super Pressure Trapezium Mill which has got many patents ...
José G. Hernández, Eusebio Juaristi, Efficient ball-mill procedure in the 'green' asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water, Tetrahedron, 10.1016/j.tet.2011.06.042, 67, 36, (6953-6959), (2011).
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 are revealed.
l-Proline-based small peptides have been developed as efficient catalysts for the asymmetric direct aldol reactions of hydroxyacetone with aldehydes. Chiral 1,4-diols 7, which are disfavored products in similar aldol reactions catalyzed by either aldolases or l-proline, were obtained in high yields and enantioselectivities of up to 96% ee with peptides 3 and 4 in aqueous media.
본 발명은 n-치환 말레이미드류의 제조방법에 관한 것으로서, 더욱 상세하게는 기존 n-치환 말레인 아미드산을 제조 후 n-치환 말레이미드류를 제조하는 방법과 달리, n-치환 말레인 아미드산을 별도로 제조하지 않고 반응기에 유기용제, 산 촉매, 탈수 조촉매와 안정화제를 투입한 후, 1차 아민을 ...
May 22, 2007· 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.
본 발명은 n-치환 말레이미드류의 제조방법에 관한 것으로서, 더욱 상세하게는 기존 n-치환 말레인 아미드산을 제조 후 n-치환 말레이미드류를 제조하는 방법과 달리, n-치환 말레인 아미드산을 별도로 제조하지 않고 반응기에 유기용제, 산 촉매, 탈수 조촉매와 안정화제를 투입한 후, 1차 아민을 ...
l-Proline-based small peptides have been developed as efficient catalysts for the asymmetric direct aldol reactions of hydroxyacetone with aldehydes. Chiral 1,4-diols 7, which are disfavored products in similar aldol reactions catalyzed by either aldolases or l-proline, were obtained in high yields and enantioselectivities of up to 96% ee with peptides 3 and 4 in aqueous media.
A Highly Efficient Solvent-Free Asymmetric Direct Aldol Reaction Organocatalyzed by Recoverable (s)-Binam-L-Prolinamides. ... 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 enantioselectivities ...
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).
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Jan 20, 2011· 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. Jose G. Hernandez, Eusebio Juaristi.
Sep 09, 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 be an efficient organocatalyst, and the aldol reaction proceeded with good chemical ...
José G. Hernández, Eusebio Juaristi, Efficient ball-mill procedure in the 'green' asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water, Tetrahedron, 10.1016/j.tet.2011.06.042, 67, 36, (6953-6959), (2011).
Efficient ball-mill procedure in the 'green' asymmetric ... demonstrated that the efficiency of the process using High Speed In the field of organocatalysis, the asymmetric aldol reaction has Ball-Milling (HSBM) was superior relative to traditional magnetic been extensively studied in view of the fact that this reaction is one stirring: reaction times were shorter and in general chemical ...
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 reagents and the catalyst. The best results
Asymmetric organocatalysis in a ball mill – Beilstein TVAug 20, 2013 In this video the authors present asymmetric organocatalyses performed in a ball mill. Thr. ... T130X Superfine Grinding Mill Optimized, Accurate, Reliable, Efficient T130X Superfine Grinding Mill evolves from TGM Super Pressure Trapezium Mill which has got many patents ...
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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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