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.,-dipeptide (s,s)-2 catalyzed the stereoselective formation of the expected aldol products, with higher diastereo- and.
Jos g.Hernndez 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).
Chat OnlineDownload citation on researchgate | a highly efficient asymmetric organocatalytic aldol reaction in a ball mill | anti-aldol products with up to 99 % enantiomeric excess (ee) have been obtained.
Chat OnlineEfficient ball-mill procedure in the 'green' asymmetric aldol reaction.The organocatalytic activity of (s)-proline-based dipeptides 1ac has been evaluated in the asymmetric aldol reaction between representative ketones with vari.
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Chat Onlineefficient organocatalyst studied promoting the direct aldol reaction of cycloalkyl, alkyl, and -functionalized ketones with aromatic aldehydes in the presence of water and under solvent-free reaction conditions employing only 2 equiv.Of nucleophile.Generally, anti-aldol products are.
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Chat OnlineThe 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.,-dipeptide (s,s)-2 catalyzed the stereoselective formation of the expected aldol products, with higher diastereo- and.
Chat Onlinefor example, in the asymmetric aldol reaction organocatalyzed by l-proline reported by list and barbas et al.1a in addition to the remarkable novelty of constituting the first example of a nonmetallic small-molecule catalyst for direct intermolecular asymmetric aldol reactions , 1a this development can also be classified as a green.
Chat OnlineEfficient ball-mill procedure in the green asymmetric aldol reaction organocatalyzed by (s)-proline-containing dipeptides in the presence of water.Tetrahedron, 67 (2011), pp.
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Chat OnlineRodriguez b, bruckmann a, bolm c.A highly efficient asymmetric organocatalyticaldol reaction in a ball mill.Chemeurj2007; 13: 4710-4722.Hernandez j g, juaristi e.Efficient ball-mill procedure in the green asymmetric aldol reaction organocatalyzed by (s)-proline-containing dipeptides in the presence of water.Tetrahedron2011; 67: 6953-6959.
Chat Online[23] hernndez j.G., juaristi e., efficient ball-mill procedure inthe green asymmetric aldol reaction organocatalyzed by(s)-proline-containing dipeptides in the presence of .
Chat OnlineHernndez jg, juaristi e.Efficient ball-mill procedure in the green asymmetric aldol reaction organocatalyzed by (s)-proline-containing dipeptides in the presence of .
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Chat OnlineThe first enantioselective total synthesis of the proposed structure of nfat-133 [(10,11,12)-] and its c10 epimer [(10,11,12)-] was achieved from a known aromatic ester by a 10-step sequence that featured chiral auxiliary-directed asymmetric alkylation and the evans asymmetric aldol reaction as the chirality-inducing steps.Read more.
Chat OnlineEfficient ball-mill procedure in the green asymmetric aldol reaction organocatalyzed by ( s)-proline-containing dipeptides in the presence of water more by eusebio juaristi publication date: sep 1, 2011.
Chat Onlineorganocatalysts are low-molecular mass organic compounds composed of nonmetallic elements.Supramolecular assemblies of amphiphilic l-proline regulated by compressed co 2 as a recyclable organocatalyst for the asymmetric aldol reaction.Efficient ball-mill procedure in the green asymmetric aldol reaction organocatalyzed by (s).
Chat OnlineAmong different organocatalysts used for asymmetric aldol reactions, proline and its derivatives emerged as powerful catalysts for the enamine activation of donor aldehyde or ketone.Bolms group reported a solvent-free asymmetric organocatalytic aldol reaction under ball-milling conditions using l .
Chat Onlinebinam-prolinamides are very efficient catalyst for the synthesis of non-protected and n-benzyl isatin derivatives by using an aldol reaction between ketones and isatins under solvent-free conditions.The results in terms of diastereo- and enantioselectivities are good, up to 99% de and 97% ee, and higher to those previously reported in the literature under similar reaction conditions.
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Chat OnlineAn 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 1af as organocatalysts is reported.
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