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Published on: June 21, 2017
Enamine Acylation Enabled Desymmetrization of Malonic Esters
Yu-Ping He1,2, Zhuo-Chen Li1, Zi-Qi Wang1
1Shanghai Frontiers Science Center for Drug Target Identification and Delivery, National Key Laboratory of Innovative Immunotherapy, and Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmaceutical Sciences, Shanghai Jiao Tong University, Shanghai 200240, China.
This study introduces the first enantioselective enamine acylation, a novel method for creating complex molecules. It utilizes chiral phosphoric acid catalysis for stereoselective synthesis of pyrrolinones and indolinones.
Area of Science:
- Organic Chemistry
- Asymmetric Catalysis
Background:
- Asymmetric enamine alkylation is established for stereoselective C-C bond formation.
- Enantioselective enamine acylation methods are underdeveloped.
Purpose of the Study:
- To develop the first enantioselective enamine acylation reaction.
- To synthesize pyrrolinones and indolinones with tetrasubstituted stereocenters.
Main Methods:
- Chiral phosphoric acid catalyzed intramolecular α-carbon acylation.
- Desymmetrization strategy and bifunctional organocatalysis.
- Use of aminomalonic esters and cyclic ketones with low-electrophilicity esters as acylating agents.
Main Results:
- Achieved the first example of enantioselective enamine acylation.
- Successfully synthesized pyrrolinones and indolinones bearing tetrasubstituted stereocenters.
- Demonstrated utility in the synthesis of (+)-LipidGreen I and II.
Conclusions:
- Developed a novel and efficient method for enantioselective enamine acylation.
- Established the reaction pathway and stereocontrol mechanism through experimental and computational studies.
- Provided a valuable alternative for synthesizing complex chiral molecules.
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