Volume 53, Issue 25 pp. 6506-6510
Communication

Access to Oxoquinoline Heterocycles by N-Heterocyclic Carbene Catalyzed Ester Activation for Selective Reaction with an Enone

Dr. Zhenqian Fu

Dr. Zhenqian Fu

Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore)

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Dr. Ke Jiang

Dr. Ke Jiang

School of Biological Sciences, Nanyang Technological University, Singapore 637371 (Singapore)

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Dr. Tingshun Zhu

Dr. Tingshun Zhu

Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore)

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Prof. Dr. Jaume Torres

Prof. Dr. Jaume Torres

School of Biological Sciences, Nanyang Technological University, Singapore 637371 (Singapore)

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Prof. Dr. Yonggui Robin Chi

Corresponding Author

Prof. Dr. Yonggui Robin Chi

Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore)

Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore)Search for more papers by this author
First published: 18 May 2014
Citations: 97

We thank the Singapore National Research Foundation (NRF), Singapore Economic Development Board (EDB), GlaxoSmithKline (GSK), and Nanyang Technological University (NTU) for generous financial support. We thank Dr. Y. Li and Dr. R. Ganguly (X-ray structure, NTU) for their contribution. K.J. and J.T. acknowledge the financial support from the National Research Foundation grant NRF-CRP4-2008-02.

Graphical Abstract

Under construction: A single-step enantioselective access to multicyclic oxoquinoline-type heterocycles is possible. The process takes advantage of the unique reaction patterns of esters under N-heterocyclic carbene (NHC) catalysis. It involves activation of the β-carbon atom of an ester as the key step with a subsequent chemoselective cascade reaction with amino enone substrates. Ts=4-toluenesulfonyl.

Abstract

Organocatalytic ester activation is developed for a highly selective cascade reaction between saturated esters and amino enones. The reaction involves activation of the β-carbon atom of the ester as a key step. This method allows a single-step access to multicyclic oxoquinoline-type heterocycles with high enantiomeric ratios.

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