Highlyanti-Selective Asymmetric Aldol Reactions Using Chiral Zirconium Catalysts. Improvement of Activities, Structure of the Novel Zirconium Complexes, and Effect of a Small Amount of Water for the Preparation of the Catalysts

2002 ◽  
Vol 124 (13) ◽  
pp. 3292-3302 ◽  
Author(s):  
Yasuhiro Yamashita ◽  
Haruro Ishitani ◽  
Haruka Shimizu ◽  
Shū Kobayashi
Keyword(s):  
Aldol Reactions ◽  
The Novel ◽  
Asymmetric Aldol ◽  
Zirconium Complexes ◽  
Zirconium Catalysts

scholarly journals Novel Pyrazole Derivatives Having Mono/Di Chiral Centered Group as Organocatalyst for Henry Reaction

2020 ◽  
Vol 39 (1) ◽  
pp. 17
Author(s):  
Adnan Çetin ◽  
Ishak Bildirici ◽  
Selçuk Gümüş
Keyword(s):  
Methyl Ester ◽  
Electronic Properties ◽  
Computational Analysis ◽  
Aldol Reactions ◽  
The Novel ◽  
Pyrazole Derivatives ◽  
Henry Reaction ◽  
Asymmetric Aldol ◽  
Chiral Compounds ◽  
Structural And Electronic Properties

The chiral substituted pyrazole-3-carboxamides (4a-c), pyrazole-3-carboxylates (5a-c), pyrazole-3-thioureides (7a-c) and pyrazole-3,4-dicarboxamides (10a-c) were prepared via the pyrazolo-3-chlorocarbonyl 2, pyrazolo-3,4-dicarboxy methyl ester 3 with pyrazole-3-isothiocyanate 6 with different (R)-chiral amino alcohols. All of the synthesized chiral compounds binding a pyrazole skeleton were investigated as organocatalysts for asymmetric aldol reactions between nitromethane and p-nitrobenzaldehyde in the presence of CuCl. Enantiomeric excesses and the reaction yields were found to be appropriate values. Furthermore, the best organocatalyst applied in this study was identified after careful optimization of conditions. Lastly, all of the novel compounds were subjected to computational analysis at the B3LYP/6-31++G(d,p) level of theory to obtain information about their structural and electronic properties.

(S)-5-prolylamide-triazole Organocatalyst for Direct Asymmetric Aldol Reactions

2013 ◽  
Vol 17 (14) ◽  
pp. 1563-1568 ◽  
Author(s):  
Ling Liu ◽  
Min-Na Gao ◽  
Yang Li ◽  
Zhen Li ◽  
Liping Song ◽  
...  
Keyword(s):  
Aldol Reactions ◽  
Asymmetric Aldol

ChemInform Abstract: Organocatalytic Asymmetric Aldol Reactions Mediated by a Cysteine-Derived Prolinamide.

ChemInform ◽  
2008 ◽  
Vol 39 (48) ◽  
Author(s):  
Ricardo S. Schwab ◽  
Fabio Z. Galetto ◽  
Juliano B. Azeredo ◽  
Antonio L. Braga ◽  
Diogo S. Luedtke ◽  
...  
Keyword(s):  
Aldol Reactions ◽  
Asymmetric Aldol

Synthesis and evaluation of (S)-proline-containing dipeptidic organocatalysts bound to MBHA resin in asymmetric aldol reactions

2015 ◽  
Vol 56 (44) ◽  
pp. 6047-6051 ◽  
Author(s):  
Elizabeth Machuca ◽  
Giovanna Granados ◽  
Bruno Hinojosa ◽  
Eusebio Juaristi
Keyword(s):  
Aldol Reactions ◽  
Asymmetric Aldol

Intramolecular hydrogen bonding guides a cationic amphiphilic organocatalyst to highly stereoselective aldol reactions in water

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62331-62335 ◽  
Author(s):  
Ángel M. Valdivielso ◽  
Alba Catot ◽  
Ignacio Alfonso ◽  
Ciril Jimeno
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Structural Motif ◽  
Aldol Reactions ◽  
Asymmetric Aldol ◽  
Neutral Ph ◽  
Intramolecular Hydrogen

A novel amphiphilic acylguanidine organocatalyst using intramolecular hydrogen bonding as a key structural motif is efficient for asymmetric aldol reactions of ketones in water at neutral pH.

Non-linear effects in acyclic amino acid-catalyzed direct asymmetric aldol reactions

2006 ◽  
Vol 47 (37) ◽  
pp. 6657-6661 ◽  
Author(s):  
Pawel Dziedzic ◽  
Weibiao Zou ◽  
Ismail Ibrahem ◽  
Henrik Sundén ◽  
Armando Córdova
Keyword(s):  
Amino Acid ◽  
Aldol Reactions ◽  
Asymmetric Aldol ◽  
Non Linear ◽  
Linear Effects ◽  
Acid Catalyzed

Asymmetric Aldol Reactions under Normal and Inverse Addition Modes of the Reagents.

ChemInform ◽  
2007 ◽  
Vol 38 (44) ◽  
Author(s):  
Saumen Hajra ◽  
Aswini Kumar Giri ◽  
Ananta Karmakar ◽  
Snehadrinarayan Khatua
Keyword(s):  
Aldol Reactions ◽  
Asymmetric Aldol

ChemInform Abstract: Direct Asymmetric Aldol Reactions in Brine Using Novel Sulfonamide Catalyst.

ChemInform ◽  
2009 ◽  
Vol 40 (36) ◽  
Author(s):  
Tsuyoshi Miura ◽  
Yumi Yasaku ◽  
Naka Koyata ◽  
Yasuoki Murakami ◽  
Nobuyuki Imai
Keyword(s):  
Aldol Reactions ◽  
Asymmetric Aldol
Sign in / Sign up

Export Citation Format

Share Document