Synthesis 2022; 54(20): 4539-4550
DOI: 10.1055/a-1874-6399
paper

5-Amino-Substituted 2-Methoxy-1,3,4-oxadiazoles as Common Precursors Toward 1,3,4-Oxadiazol-2(3H)-ones and 1,2,4-Triazolidine-3,5-diones

Authors

  • Dolnapa Yamano

    a   Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
  • Subin Jaita

    b   Faculty of Science and Agricultural Technology, Rajamangala University of Technology Lanna Chiang Rai, Chiang Rai 57120, Thailand
    c   Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand
  • Surat Hongsibsong

    d   School of Health Science Research, Research Institute for Health Science, Chiang Mai University, Chiang Mai 50200, Thailand
  • Saranphong Yimklan

    a   Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
    e   Research Center on Chemistry for Development of Health Promoting Products from Northern Resources, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
  • Wong Phakhodee

    a   Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
    e   Research Center on Chemistry for Development of Health Promoting Products from Northern Resources, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
  • Mookda Pattarawarapan

    a   Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
    c   Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand
    e   Research Center on Chemistry for Development of Health Promoting Products from Northern Resources, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand

Financial support for this study was provided by The Thailand Research Fund through the Royal Golden Jubilee (RGJ) Ph.D. Programme (Grant No. PHD/0023/2559 to D.Y.). This research work was partially supported by Chiang Mai University, Thailand.


Graphical Abstract

Abstract

The divergent synthesis of two different classes of azole derivatives using 5-amino-substituted 2-methoxy-1,3,4-oxadiazoles as common substrates is reported. Depending on the reaction time and temperature, alkylation of oxadiazoles with excess alkyl halides proceeds with high regioselectivity toward 1,3,4-oxadiazolones and 1,2,4-triazolidine-3,5-diones. This operationally simple protocol enables rapid access to a diverse set of isomeric azoles using minimum synthetic steps and easily accessible oxadiazole key precursors.

Supporting Information



Publication History

Received: 19 May 2022

Accepted after revision: 13 June 2022

Accepted Manuscript online:
13 June 2022

Article published online:
20 July 2022

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