scholarly journals A study of the sequential Michael addition-ring closure reaction of ethyl acetoacetate with chalcone: influence of quaternary ammonium cations as phase transfer catalysts

2005 ◽  
Vol 16 (5) ◽  
pp. 1048-1053
Author(s):  
Regina C. V. Lopes ◽  
Maria da Conceição F. de Oliveira ◽  
Telma L. G. de Lemos ◽  
Marcos C. de Mattos
Keyword(s):  
Michael Addition ◽  
Quaternary Ammonium ◽  
Ethyl Acetoacetate ◽  
Phase Transfer ◽  
Ring Closure ◽  
Phase Transfer Catalysts ◽  
Quaternary Ammonium Cations

Highly enantioselective Michael addition reactions with new trimeric chiral phase transfer catalysts

2015 ◽  
Vol 39 (4) ◽  
pp. 3098-3104 ◽  
Author(s):  
Arockiam Jesin Beneto ◽  
Jayaraman Sivamani ◽  
Veeramanoharan Ashokkumar ◽  
Rajendiran Balasaravanan ◽  
Kumaraguru Duraimurugan ◽  
...  
Keyword(s):  
Michael Addition ◽  
Quaternary Ammonium ◽  
Phase Transfer ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Addition Reactions ◽  
Chiral Phase ◽  
Catalytic Activities ◽  
Phase Transfer Catalysts ◽  
Chiral Phase Transfer Catalysts

New types of mesitylene based tri-site containing asymmetric quaternary ammonium salts 9 (9a and 9b) were synthesized and their catalytic activities were studied using Michael addition reactions with various chalcones and diethylmalonate under mild basic conditions with very good yields and ee's.

Comparison of betaine and l-stachydrine as phase-transfer catalysts in Michael addition and Darzens reaction

2006 ◽  
Vol 60 (5) ◽  
Author(s):  
E. Veverková ◽  
R. Droppová ◽  
Š. Toma
Keyword(s):  
Microwave Irradiation ◽  
Michael Addition ◽  
Reaction Rate ◽  
Catalytic Effect ◽  
Phase Transfer ◽  
Liquid System ◽  
Darzens Reaction ◽  
Phase Transfer Catalysts ◽  
Solid Liquid

AbstractBetaine and l-stachydrine have been tested as phase-transfer catalysts in Michael and Darzens reactions. The catalytic effect of l-stachydrine was found comparable to that of betaine in Michael addition and even higher when considering Darzens reaction. The desired products have been obtained in higher yields in solid-liquid system than under liquid-liquid bi-phase conditions. The influence of microwave irradiation and ultrasound on the reaction rate has been studied.

Highly Enantioselective Asymmetric Michael Addition Reactions with New Chiral Multisite Phase-Transfer Catalysts

Synlett ◽  
2014 ◽  
Vol 25 (12) ◽  
pp. 1685-1691 ◽  
Author(s):  
Ayyanar Siva ◽  
Sivamani Jayaraman ◽  
Duraimurugan Kumaraguru ◽  
Jesin Arockiam ◽  
Subha Paulpandian ◽  
...  
Keyword(s):  
Michael Addition ◽  
Phase Transfer ◽  
Addition Reactions ◽  
Phase Transfer Catalysts ◽  
Asymmetric Michael Addition
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