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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
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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
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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-containing dipeptides and thiodipeptides 1a–f as organocatalysts is reported.In general, (S)-proline-containing thiodipeptides proved to be better organocatalysts …
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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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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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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 reaction organocatalyzed by (S)-proline-containing dipeptides in the presence of water JG Hernández, E Juaristi Tetrahedron 67 (36), 6953-6959, 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 By Eusebio Juaristi Novel prolinamideeureas as organocatalysts for the asymmetric aldol reaction
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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, E. Juaristi Chemistry
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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 By Eusebio Juaristi Novel prolinamideeureas as organocatalysts for the asymmetric aldol reaction
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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. Tetrahedron 2011, 67 (36), 6953-6959.
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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
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Angewandte Chemie DOI: 10.1002/ange.200703606 Asymmetric Synthesis Highly Efficient Asymmetric Direct Stoichiometric Aldol Reactions on/in Water** Junmin Huang, Xiaotong Zhang, and Daniel W. Armstrong* Many enzymes catalyze reactions in water under mild example, proline-catalyzed aldol reactions[10] can only afford conditions with high efficiency …
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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).
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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 ...
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Aldol reaction. Since the origin of organocatalysis, the asymmetric aldol reaction has been one of the most intensely studied reactions, providing an easy access to chiral β-hydroxycarbonyl compounds, which are important building blocks for various bioactive molecules .Among different organocatalysts used for asymmetric aldol reactions, proline …
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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 JG Hernández, E Juaristi Tetrahedron 67 (36), 6953-6959, 2011
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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 …
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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 …
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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 …
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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 …
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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
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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). Here, we report that water/methanol mixtures are …
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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 …
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Hematite Iron Ore Processing Products To Dry. hematite iron ore beneficiation by dry process in philippines, The Important Factors to Consider When, beneficiation process of iron ore hematite dry separationProcesses for Beneficiation of Iron Ores, Crushing and grinding is a multi staged process and may use dry or wet ore, This separation process is based .beneficiation process …
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