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Green chemistry approaches have focussed on developing hydrolases for Michael-type additions in organic solvents 19 and on replacing organic solvents e g by green solvents 20 and ionic liquids 21 solvent-free reactions in ball mills 22 and reactions on water 23 As catalytic asymmetric Michael addition reactions in water represent an ideal

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The synthesis of a series of six new per-substituted p-tert-butylcalix[9]arenes derivatives has been achieved Functions such as ester nitrile or carbonate have been grafted on the phenolic oxygens of calix[9]arene p-tert-butylcalix[9]arene nona-ethyl acetate p-tert-butylcalix[9]arene nona-carboxylic acid p-tert-butylcalix[9]arene nona-cyanopropyloxy p-tert-butylcalix[9]arene nona-tert

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Efficient Ball Mill Procedure In The Green Asymmetric Efficient Ball Mill Procedure In The Green Asymmetric Aldol Reaction Efficient 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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Solvent-free asymmetric organocatalysis in a ball mill Solvent-free asymmetric organocatalysis in a ball mill Rodrguez B(1) Rantanen T Bolm C Author information (1)Institut fr Organische Chemie Chat Now efficient ball mill procedure in the 'green' asymmetric Home Application efficient ball mill procedure in the 'green' asymmetric aldol reaction efficient ball mill

The synthesis of a series of six new per-substituted p-tert-butylcalix[9]arenes derivatives has been achieved Functions such as ester nitrile or carbonate have been grafted on the phenolic oxygens of calix[9]arene p-tert-butylcalix[9]arene nona-ethyl acetate p-tert-butylcalix[9]arene nona-carboxylic acid p-tert-butylcalix[9]arene nona-cyanopropyloxy p-tert-butylcalix[9]arene nona-tert

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

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Solvent-free asymmetric organocatalysis in a ball mill Solvent-free asymmetric organocatalysis in a ball mill Rodrguez B(1) Rantanen T Bolm C Author information (1)Institut fr Organische Chemie Chat Now efficient ball mill procedure in the 'green' asymmetric Home Application efficient ball mill procedure in the 'green' asymmetric aldol reaction efficient ball mill

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In chemical synthesis click chemistry is a class of biocompatible small molecule reactions commonly used in bioconjugation allowing the joining of substrates of choice with specific biomolecules Click chemistry is not a single specific reaction but describes a way of generating products that follow examples in nature which also generates substances by joining small modular units

Subsequently he developed the first proline-catalyzed asymmetric intermolecular aldol Mannich Michael and α-amination reactions and received a grant on Asymmetric Aminocatalysis from the National Institutes of Health He moved to the Max-Planck-Institut fr Kohlenforschung in 2003 as an associate professor (2003−2005) and currently is a

Efficient Ball Mill Procedure In The Green Asymmetric Aldol Reaction 2011-3-4the 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

achieved by Zefirov and co-workers by a reaction of 1 2-phenylenediamine and 2 3-naphthoquinone in a vibrational ball mill (eq 6) 24 Molybdate sulfuric acid (MSA) has also been reported to be an efficient and reusable catalyst for the synthesis of phenazine derivatives by condensation of 1 2-diketones and 1 2-phenylenediamines in ethanol by

The MOF acted as a catalyst in the green synthesis of pyrimidine chalcones via aldol condensation of ketones and formylpyrimidines Using the MOF gave a very high yield and easy isolation of the product which reduced waste products hence making it an eco-friendly synthesis The reaction is shown in Figure 12 Figure 12 Aldol condensation of ketones with formylpyrimidines to form pyrmidine

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The Domino Oxa-Michael-Aldol-Reaction Reinvestigated A New P-Based Organocatalyst for Xanthenone Scaffolds C J Friedmann S Brse Synlett 2010 774-776 Synthesis of Paracyclophane Thiols via an Unprecedented Reduction/Deprotection Sequence Direct Conversion of t-Butylsulfoxides into Thiols with Boron Tribromide D Fritz S Brse Synlett 1544-1548 Solid-phase synthesis of w

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