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Synthetic scheme of 5-substituted 2-aminobenzothiazole and 6-substituted 2-aminobenzothiazole. Reagents and conditions: (a) I, K2CO3, Pd(PPh3)4, 1,4-dioxane–H2O, 80 °C; (b) (CH3)3SiCl, pyridine, CH3CN, rt; (c) RCOCl; (d) I, K2CO3, Pd(PPh3)4, 1,4-dioxane–H2O, 80 °C; (e) (CH3)3SiCl, pyridine, CH3CN, rt; (f) RCOCl; (g) RCOCl, pyridine, CH3CN, rt; (h) II, K2CO3, Pd(PPh3)4, 1,4-dioxane–H2O, 80 °C.
