Name is 3-Piperazinobenzisothiazole hydrochloride, as a common heterocyclic compound, it belongs to isothiazole compound, and cas is 87691-88-1, its synthesis route is as follows.

To a flask equipped with mechanical stirrer, thermometer, condenser and nitrogen inlet was added 6-cUoro-5-(2-cHoroethyl)-l,3-dihydro-2H-indol-2- one (9.0 g, 39.1 mrnol), 3-(l-pirhoerazinyl)-l,2-benzoisothiazole hydrochloride (10.0 g, 39.1 mmol), sodium carbonate (9.96 g, 117.5 mmol) and poly(ethylene glycol) methyl ether (Mn= 350, 40 mL) and the suspension was heated to 120- 1250C under nitrogen for about 48 hrs. The suspension was cooled and poured into water. The suspension was cooled to 20-250C, the product was collected by filtration on a Buchner funnel and the filter cake was rinsed with water at 20-250C. The damp product was transferred to a flask equipped with mechanical stirrer, 100 mL of water were added and the suspension stirred at ambient temperature for 1 h. The suspension was filtered, washed with water and transferred to a drying oven and dried in vacuo. This afforded 14.2 g (88% yield) of crude ziprasidone.

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Reference£º
Patent; APOTEX PHARMACHEM INC.; WO2006/47893; (2006); A1;,
Isothiazole – Wikipedia
Isothiazole – ScienceDirect.com