Scheme 3.
Synthesis of 3-benzothiazole daphnetin derivatives. Reagents and conditions: (a) NaCN, DMF, I2, 6 h, 58%; (b) H2SO4, H2O, 80 °C, 3 h, 36%. (c) H2SO4, H2O, 100 °C, 8 h; 60%; (d) ZnBr, NaN3, dioxane, 90 °C, 12 h, 42%.
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