Synthesis 2018; 50(17): 3499-3505
DOI: 10.1055/s-0037-1610168
paper
© Georg Thieme Verlag Stuttgart · New York

Phosphine-Free [3+2] Cycloaddition of Propargylamines with Dialkyl Azodicarboxylates: An Efficient Access to Pyrazole Backbone

Authors

  • Yicheng Zhang

    a   School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. of China   Email: xsjia@mail.shu.edu.cn
    b   Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. of China   Email: jieliu_1024@163.com
  • Jie Liu*

    b   Department of Chemistry, Huaibei Normal University, Huaibei, Anhui 235000, P. R. of China   Email: jieliu_1024@163.com
  • Xueshun Jia*

    a   School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. of China   Email: xsjia@mail.shu.edu.cn
    c   Department of Chemistry, Shanghai University, Shanghai 200444, P. R. of China

We gratefully acknowledge the National Natural Science Foundation of China (No. 21472121) for financial support.
Further Information

Publication History

Received: 13 March 2018

Accepted after revision: 28 April 2018

Publication Date:
18 June 2018 (online)


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Abstract

A phosphine-free [3+2] cycloaddition reaction of the substituted propargylamines with dialkyl azodicarboxylates at room temperature is described. This reaction provides a new approach to functionalized pyrazoles in good yields and high selectivity.

Supporting Information