Figure 4. Scheme for the preparation of benzothiazole derivatives of sulfonamide given by Nadeem Siddiqui in 2007. (a)pyridine/Ac2O; (b)CH3COOH (80%) boiling 6 h; (c) NCS, EtOH/reflux, 2 h. R1- F, Cl, OCH3. R2- CH3, C2H5

From

Recent Advances in Development of Sulfonamide Derivatives and Their Pharmacological Effects- A Review

Ajeet, Arun K. Mishra, Arvind Kumar

American Journal of Pharmacological Sciences. 2015, 3(1), 18-24 doi:10.12691/ajps-3-1-4