scholarly journals Revisiting the Juliá–Colonna enantioselective epoxidation: supramolecular catalysis in water

2017 ◽  
Vol 53 (37) ◽  
pp. 5099-5102 ◽  
Author(s):  
Christopher Bérubé ◽  
Xavier Barbeau ◽  
Patrick Lagüe ◽  
Normand Voyer
Keyword(s):  
Unsaturated Ketones ◽  
Supramolecular Catalysis ◽  
Water As Solvent ◽  
Enantioselective Epoxidation

With only water as solvent, poly-l-leucine serves as supramolecular catalyst for the epoxidation of α,β-unsaturated ketones.

Reaction of Coumarin Derivatives with Nucleophiles in Aqueous Medium

2008 ◽  
Vol 63 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Mazaahir Kidwai ◽  
Shweta Rastogi ◽  
Keyword(s):  
Microwave Irradiation ◽  
Aqueous Medium ◽  
Reaction Times ◽  
Parallel Synthesis ◽  
Synthetic Approach ◽  
Coumarin Derivatives ◽  
Green Catalyst ◽  
Unsaturated Ketones ◽  
Water As Solvent

A series of heterocycles was synthesized by the reaction of α,β -unsaturated ketones of benzopyrans or coumarins with various nucleophiles in aqueous medium bearing two points of diversity. Compared to an identical library generated by conventional parallel synthesis, a microwaveassisted procedure dramatically decreased reaction times from hours to minutes, and yields of products and intermediates were improved remarkably. This synthetic approach is ecofriendly in nature which features water as solvent, microwave irradiation, and usage of a “green” catalyst (K2CO3).

Asymmetric catalysis with self-organized chiral lanthanum complexes: Practical and highly enantioselective epoxidation of ?,?-unsaturated ketones

Chirality ◽  
2002 ◽  
Vol 15 (1) ◽  
pp. 83-88 ◽  
Author(s):  
Kazuhiro Daikai ◽  
Tetsuji Hayano ◽  
Rie Kino ◽  
Hiroshi Furuno ◽  
Takumi Kagawa ◽  
...  
Keyword(s):  
Asymmetric Catalysis ◽  
Unsaturated Ketones ◽  
Self Organized ◽  
Enantioselective Epoxidation

Ultrasonic assisted dimeric cinchona based chiral phase transfer catalysts for highly enanatioselective synthesis of epoxidation of α,β-unsaturated ketones

RSC Advances ◽  
2014 ◽  
Vol 4 (104) ◽  
pp. 60293-60299 ◽  
Author(s):  
Jayaraman Sivamani ◽  
Veeramanoharan Ashokkumar ◽  
Velu Sadhasivam ◽  
Kumaraguru Duraimurugan ◽  
Ayyanar Siva
Keyword(s):  
Ultrasonic Irradiation ◽  
Phase Transfer ◽  
Cinchona Alkaloids ◽  
Ammonium Bromide ◽  
Chiral Phase ◽  
Unsaturated Ketones ◽  
Phase Transfer Catalysts ◽  
Ultrasonic Assisted ◽  
Chiral Phase Transfer Catalysts ◽  
Enantioselective Epoxidation

New types of bis-quaternary ammonium bromide as chiral multisite phase transfer catalysts derived from cinchona alkaloids have been developed and evaluated for the enantioselective epoxidation of chalcones in the presence of lower concentrations of various oxidants, bases and ultrasonic irradiation conditions.

ChemInform Abstract: Highly Enantioselective Epoxidation of α,β-Unsaturated Ketones Catalyzed by Primary-Secondary Diamines.

ChemInform ◽  
2012 ◽  
Vol 43 (17) ◽  
pp. no-no
Author(s):  
Yingpeng Lu ◽  
Changwu Zheng ◽  
Yingquan Yang ◽  
Gang Zhao ◽  
Gang Zou
Keyword(s):  
Unsaturated Ketones ◽  
Enantioselective Epoxidation

Enantioselective epoxidation of α,β-unsaturated ketones catalyzed by stapled helical l-Leu-based peptides

Tetrahedron ◽  
2011 ◽  
Vol 67 (34) ◽  
pp. 6155-6165 ◽  
Author(s):  
Yosuke Demizu ◽  
Nanako Yamagata ◽  
Saori Nagoya ◽  
Yukiko Sato ◽  
Mitsunobu Doi ◽  
...  
Keyword(s):  
Unsaturated Ketones ◽  
Enantioselective Epoxidation
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