Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (5): 20240033.doi: 10.7503/cjcu20240033

• Organic Chemistry • Previous Articles     Next Articles

Synthesis of Thieno[2,3-b]thiopyran-4-one Derivatives by Palladium Catalysts

REN Chuanqing(), JI Xiaohui, ZHANG Qiang, CAO Xiaoyan, JI Jianwei, LIU Bo   

  1. Shaanxi Key Laboratory of Catalysis,School of Chemical & Environmental Science,Shaanxi University of Technology,Hanzhong 723000,China
  • Received:2024-01-19 Online:2024-05-10 Published:2024-03-06
  • Contact: REN Chuanqing E-mail:rcqing2008@126.com
  • Supported by:
    the National Natural Science Foundation of China(22101165);the Project of the Key Laboratory of Education Department of Shaanxi Province, China(23JS002)

Abstract:

Thieno[2,3-b]thiopyrans are important core structures found in a variety of natural products and other biologically important molecules with a wide range of biological activities. In this work, a series of thieno[2,3-b]thiopyran-4-one derivatives was constructed from 1,6-disubstituted group-4-(1,3-dithiolan-2-ylidene)-1-en-5-yn-3-one via palladium-catalyzed cycloaddition reactions. Optimization experiments showed that the best experimental conditions were as follows: using Pd(OAc)2 (30%, molar fraction) as catalyst, the substrate(1.0 mmol) and K2CO3(1.2 mmol) reacted at 100 ℃ for 8 h in NN-dimethylformamide(DMF), thieno[2,3-b]thiopyran-4-one derivatives were synthesized with a yield of 87%. The composition and structure has been characterized by menas of nuclear magnetic resonance(1H NMR and 13C NMR) and high resolution mass spectrometer(electrospray ionization)[HRMS(ESI)]. The mechanism for the reaction was proposed. The menthod had the advantages of mild conditions, safe operation and higher yields.

Key words: Palladium acetate, Catalyze, Thiophene[2, 3-b]thiapyran, Ketene dithioacetal

CLC Number: 

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