Scheme 2

Synthesis of 2-aminobenzo[d]thiazole-6-sulfonamide. Reaction conditions: (ii) CHCl3 (13.75 mL), rt, Br2 (0.0143 mol in 15 mL CHCl3), 50–55 °C
Synthesis of 2-aminobenzo[d]thiazole-6-sulfonamide. Reaction conditions: (ii) CHCl3 (13.75 mL), rt, Br2 (0.0143 mol in 15 mL CHCl3), 50–55 °C