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General procedure: To a solution of 3-substituted-5-benzylidene-2-thioxo-4-thiazolidinone (1-19) (0.003 mol) in 1,4-dioxane (15 mL) was added HC(OEt)3(2 mL) and BF3Et2O (2 mL). The reaction mixture washeated to 80 C and stirring was continued at the same temperature for 4 h. Theresulting 2-ethylthio-3-substituted-5-benzylidene- 4-thiazolium fluoroborate (Ic, IIc) was precipitated, filteredoff, and dried without any additional purification, as starting material forthe following reactions. To a mixture of thiazolium fluoroborate (Ic, IIc) (0.003 mol) and correspondingindolin-2-one (0.003 mol) in acetonitrile (15 mL) was added triethylamine (0.91g, 0.009 mol) dropwise at 25 C, and the mixture was stirred for 4 h at thesame temperature. The orange precipitate was collected and washed with ethylacetate (8 mL). The crude product thus obtained was recrystallized from methanol or acetone to give compound (1-19).
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Reference:
Article; Wang, Feng; Liu, Zijian; Wang, Jian; Tao, Jun; Gong, Ping; Bao, Xue; Zhao, Yanfang; Wang, Yulin; European Journal of Medicinal Chemistry; vol. 101; (2015); p. 126 – 132;,
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