efficient ball mill procedure in the green asymmetric aldol reaction

dipeptide-catalyzed direct asymmetric aldol reaction in

dipeptide-catalyzed direct asymmetric aldol reaction in

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

ball milling reactions

ball milling reactions

Efficient ball mill procedure in the green asymmetric aldol ... Efficient ball-mill procedure in the 'green' asymmetric aldol reaction... The organocatalytic activity of (S)-proline-based dipeptides 1a–c has been evaluated in ... Solid state reactions induced by ball milling - Springer

10.1016/j.tet.2011.06.042 | deepdyve

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

asymmetric aldol reaction organocatalyzed by (s)-proline

asymmetric aldol reaction organocatalyzed by (s)-proline

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 enantioselectivity relative to similar …

a highly efficient asymmetric organocatalytic aldol

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

procedure in the mill green ball asymmetric aldol

procedure in the mill green ball asymmetric aldol

Asymmetric organocatalysis in a ball mill Beilstein TV. 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

the ion tag strategy as a route to highly efficient

the ion tag strategy as a route to highly efficient

The installation of an imidazolium tag via acetate 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 ee up to >99%

a simple primarytertiary diaminebrnsted acid catalyst

a simple primarytertiary diaminebrnsted acid catalyst

Feb 27, 2007 · 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. Dmitry E. Siyutkin, Alexander S. Kucherenko, Larisa L. Frolova, Alexander V. Kuchin, Sergei G. Zlotin

efficient ball-mill procedure in the green asymmetric

efficient ball-mill procedure in the green asymmetric

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

cheminform abstract: efficient ball-mill procedure in the

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

a highly efficient solvent-free asymmetric direct aldol

a highly efficient solvent-free asymmetric direct aldol

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 enantioselectivities comparable to those in organic or aqueous …

(pdf) solvent-free asymmetric aldol reaction

(pdf) solvent-free asymmetric aldol reaction

The anti-aldol adduct was obtained in high yield and with Ball-Milling (HSBM) is a sustainable mechanochemical technique, good diastereo- and enantioselectivity (up to 69:31 dr, up to 88% which is being increasingly used in synthetic organic chemistry to ee).7 Recently, as part of our continuing interest in synthetic ap- promote several synthetically useful reactions, under solvent-free plications of HSBM,5i,8a,b we carried out the asymmetric aldol …

dr. jos g. hernndez - google scholar

dr. jos g. hernndez - google scholar

Efficient ball-mill procedure in the ‘green’asymmetric aldol reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water JG Hernández, E Juaristi Tetrahedron 67 (36), 6953-6959 , …

jos g. hernndez senior research associate ruer

jos g. hernndez senior research associate ruer

Efficient Ball-Mill Procedure in the “Green” Asymmetric Aldol Reaction Organocatalyzed by (S)-Proline-Containing Dipeptides in the Presence of Water Tetrahedron Sept. 2011 The organocatalytic

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