Synthesis 2023; 55(17): 2691-2701
DOI: 10.1055/a-2075-3140
paper

A New Domino Reaction under Microwave Irradiation for the Synthesis of Pyrazolo[5,1-b]quinazolinones

Authors

  • Jia Hui Ng

    a   School of Pharmacy, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, Selangor Darul Ehsan 47500, Malaysia
  • Felicia Phei Lin Lim

    a   School of Pharmacy, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, Selangor Darul Ehsan 47500, Malaysia
  • Edward R. T. Tiekink

    b   Research Centre for Crystalline Materials, School of Medical and Life Sciences, Sunway University, 5 Jalan Universiti, Bandar Sunway, Selangor Darul Ehsan 47500, Malaysia
  • Anton V. Dolzhenko

    a   School of Pharmacy, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, Selangor Darul Ehsan 47500, Malaysia
    c   Curtin Medical School, Curtin Health Innovation Research Institute, Faculty of Health Sciences, Curtin University, GPO Box U1987 Perth, Western Australia 6845, Australia

This work is supported by the Ministry of Higher Education, Malaysia under the Fundamental Research Grant Scheme (Grant no. FRGS/1/2020/STG04/MUSM/02/2). Sunway University Sdn Bhd is thanked for financial support of the X-ray crystallographic study (Grant no. GRTIN-RRO-56-2022).


Graphical Abstract

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Abstract

Pyrazolo[5,1-b]quinazolinones were synthesized by consecutive pyrazole and quinazolinone ring closures in a new catalyst-free microwave-promoted domino reaction of hydrazine with 2-cyano-3-(methylthio)-3-(2-methoxycarbonylphenylamino)acrylates, which were prepared from methyl anthranilate and 2-cyano-3,3-bis(methylthio)acrylates. When 2-cyano-3,3-bis(methylthio)acrylates reacted directly with anthranilic acid hydrazide, the arylamino group remained intact, while the hydrazide moiety transformed into 1-acylpyrazoles and further to 2-(1,3,4-oxadiazolylidene)-2-cyanoacetates. The structures of representatives from each group of the prepared heterocyclic compounds were examined in detail by X-ray crystallography.

Supporting Information



Publikationsverlauf

Eingereicht: 22. Februar 2023

Angenommen nach Revision: 17. April 2023

Accepted Manuscript online:
17. April 2023

Artikel online veröffentlicht:
11. Mai 2023

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