... Table 1. Process optimization and synthesis of 3-amino-1,2-benzisothiazoles. ... 110.24, 57.34, 47.06; HR MS found 220.0878; C 11 H 13 N 3 S requires (FAB P + 1) 220.0908. ... 8 (1.25 g, 4.66 mmol), anhydrous piperazine (4.01 g, 46.6 mmol), and DMSO (0.80 g, 10.3 mmol) in 15 ...