Synthesis 2023; 55(16): 2570-2580
DOI: 10.1055/a-2058-0119
paper

I2/DTBP Promoted Synthesis of C3-Carbonylated Imidazopyridines from Chromones and 2-Aminopyridines via (3+2) Cycloaddition

Authors

  • Qiang Huang

    a   School of Pharmacy, Zunyi Medical University, Zunyi, Guizhou 563000, P. R. of China
    b   The Key Laboratory of Clinical Pharmacy of Zunyi City, Zunyi Medical University, Zunyi, Guizhou 563006, P. R. of China
  • Lvjia Wu

    a   School of Pharmacy, Zunyi Medical University, Zunyi, Guizhou 563000, P. R. of China
  • Jihai Shi

    a   School of Pharmacy, Zunyi Medical University, Zunyi, Guizhou 563000, P. R. of China
  • Jiangdong Li

    c   School of Public Health, Zunyi Medical University, Zunyi, Guizhou 563000, P. R. of China
  • Wei Lu

    a   School of Pharmacy, Zunyi Medical University, Zunyi, Guizhou 563000, P. R. of China
  • Fushan Tang

    a   School of Pharmacy, Zunyi Medical University, Zunyi, Guizhou 563000, P. R. of China
    b   The Key Laboratory of Clinical Pharmacy of Zunyi City, Zunyi Medical University, Zunyi, Guizhou 563006, P. R. of China
  • Lei Zhu

    a   School of Pharmacy, Zunyi Medical University, Zunyi, Guizhou 563000, P. R. of China
    b   The Key Laboratory of Clinical Pharmacy of Zunyi City, Zunyi Medical University, Zunyi, Guizhou 563006, P. R. of China
  • Wenwu Zhong

    d   Chongqing Medical and Pharmaceutical College, Chongqing 401331, P. R. of China
  • Changkuo Zhao

    a   School of Pharmacy, Zunyi Medical University, Zunyi, Guizhou 563000, P. R. of China

Financial support from the Academic Cultivation and Innovation Exploration Special Project of Zunyi Medical University in 2018 (No. [2018]5772-013, CK-1149-011), the Young Talents Growth Project of the Higher Education Institutions of Guizhou Province (No. KY[2021]221) and the Natural Science Foundation of Guizhou Province (No. ZK[2022]592) is gratefully acknowledged.


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Abstract

An I2/DTBP-promoted (3+2) cycloaddition reaction of 2-aminopyridines and chromones is reported. The work provides a simple and efficient approach to access imidazopyridines scaffold in moderate to good yields. I2/DTBP as an initiator and oxidant was used to realize the tandem (3+2) cycloaddition/oxidative aromatization. Available starting materials, excellent functional-group tolerance, potential drug activity of the products, and application in production on a gram scale are advantageous features of this strategy. Moreover, the obtained products provide a key active fragment for the synthesis of cabozantinib analogues, which has the potential to be developed as an anticancer agent.

Supporting Information



Publikationsverlauf

Eingereicht: 21. Dezember 2022

Angenommen nach Revision: 20. März 2023

Accepted Manuscript online:
20. März 2023

Artikel online veröffentlicht:
19. April 2023

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