ChemInform Abstract: New Polymer-Supported Catalysts Derived from Cinchona Alkaloids: Their Use in the Asymmetric Michael Reaction.

ChemInform ◽  
2010 ◽  
Vol 30 (48) ◽  
pp. no-no
Author(s):  
Rosana Alvarez ◽  
Marie-Agnes Hourdin ◽  
Christian Cave ◽  
Jean d'Angelo ◽  
Pierre Chaminade
1999 ◽  
Vol 40 (39) ◽  
pp. 7091-7094 ◽  
Author(s):  
Rosana Alvarez ◽  
Marie-Agnès Hourdin ◽  
Christian Cavé ◽  
Jean d'Angelo ◽  
Pierre Chaminade

2020 ◽  
Vol 24 (13) ◽  
pp. 1397-1458
Author(s):  
Shagufta Kamal ◽  
Ameer Fawad Zahoor ◽  
Sajjad Ahmad ◽  
Rabia Akhtar ◽  
Iqra Khaliq ◽  
...  

: Michael reaction is the nucleophilic addition of active methylene compounds to conjugated olefins, resultantly affording a variety of biologically active scaffolds with high enantiopurity. To improve the reaction yield, as well as enantioselectivity of the product, a variety of catalysts (amine-based catalysts, bifunctional L-proline amides, bifunctional squaramides, chiral ionic liquids, cinchona alkaloids, enzymes, indolinols, metal catalysts, peptide derived catalytic system, phase transfer catalysts, pyrrolidine based organocatalysts) have been investigated by a different era of chemists. Besides this, different methodologies have been developed to improve reaction yield and enantioselectivity of the targeted products with low catalyst loading. : This review article provides a concise overview of the catalysts applied recently by different scientists in the Michael addition reaction. Moreover, current strategies and potential applications of this reaction have also been illustrated in this review.


2004 ◽  
Vol 36 (3) ◽  
pp. 190-197 ◽  
Author(s):  
Kenjiro Onimura ◽  
Kouhei Matsuzaki ◽  
Yong-Kyung Lee ◽  
Hiromori Tsutsumi ◽  
Tsutomu Oishi

2014 ◽  
Vol 144 (10) ◽  
pp. 1681-1688 ◽  
Author(s):  
Wenshan Zhao ◽  
Yanli Zhang ◽  
Chengke Qu ◽  
Lei Zhang ◽  
Jing Wang ◽  
...  

Catalysts ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 591
Author(s):  
Mohammad Shahid Ullah ◽  
Sadia Afrin Chhanda ◽  
Shinichi Itsuno

Under the acyclic diene metathesis (ADMET) reaction condition, the C3-vinyl groups of cinchona alkaloids readily react with each other to form a C-C bond. A novel type of cinchona alkaloid polymers was synthesized from dimeric cinchona squaramides using the Hoveyda-Grubbs’ second-generation catalysts (HG2) by means of ADMET reaction. The chiral polymers, containing cinchona squaramide moieties in their main chains, were subsequently employed as catalysts for the enantioselective Michael reaction to give the corresponding chiral adducts in high yields with excellent enantioselectivity and diastereoselectivity. Both enantiomers from the asymmetric Michael reaction were distinctively prepared while using the polymeric catalysts, possessing pseudoenantiomeric structures. The catalysts were readily recovered from the reaction mixture and recycled several times due to the insolubility of the cinchona-based squaramide polymers.


ChemInform ◽  
2014 ◽  
Vol 45 (18) ◽  
pp. no-no
Author(s):  
Kazumasa Funabiki ◽  
Masaya Ohta ◽  
Yuta Sakaida ◽  
Kiyofumi Oida ◽  
Yasuhiro Kubota ◽  
...  

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