Synthesis 2022; 54(08): 2070-2080
DOI: 10.1055/a-1707-2924
paper

Phosphonium-Mediated Synthesis of a New Class of Indoloquinazoline Derivatives Bearing a C-12 Aryloxy Ester or Spiro-γ-lactone

Authors

  • Nittaya Wiriya

    a   Department of Chemistry, 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
    b   Environmental, Occupational Health Sciences and Non-Communicable Diseases Center of Excellence, Chiang Mai University, Chiang Mai, 50200, Thailand
  • Saranphong Yimklan

    a   Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
  • Surat Hongsibsong

    b   Environmental, Occupational Health Sciences and Non-Communicable Diseases Center of Excellence, Chiang Mai University, Chiang Mai, 50200, Thailand
    c   School of Health Science Research, Research Institute for Health Science, Chiang Mai University, Chiang Mai, 50200, Thailand
  • Wong Phakhodee

    a   Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
    b   Environmental, Occupational Health Sciences and Non-Communicable Diseases Center of Excellence, Chiang Mai University, Chiang Mai, 50200, Thailand

This work was partially supported by Chiang Mai University, Thailand and the Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (Grant No. PHD/0072/2559) to N.W.


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Abstract

Indoloquinazolines functionalized at C-12, which are structural analogs of the natural alkaloid cephalanthrin B, are readily constructed via Ph3P/I2-mediated one-pot reactions of isatins with aromatic alcohols. In the presence of excess phenols, the C-12 aryloxy ester products are obtained in moderate to good yields under mild conditions. Moreover, fused bicyclic hydroxyaryl derivatives such as 8-hydroxyquinoline give rise to novel C-12 spiro-γ-lactone derivatives. A reactive iminium cation species derived from dehydration of the C-12 hydroxy ester precursor is proposed as the transient intermediate responsible for these transformations.

Supporting Information



Publication History

Received: 01 November 2021

Accepted after revision: 26 November 2021

Accepted Manuscript online:
26 November 2021

Article published online:
25 January 2022

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