It is a common heterocyclic compound, the isothiazole compound, 3-Piperazinobenzisothiazole hydrochloride, cas is 87691-88-1 its synthesis route is as follows.
3-Piperazin-1-yl-benzoisothiazole hydrochloride (1.31 g, 5.1 mmol) and (5-fluoro-2-nitro-phenyl)-acetic acid (800 mg, 4.3 mmol) were combined in 100 mL methylene chloride with triethylamine (1.20 mL, 8.6 mmol). This solution stirred for 15 min before bis-(2-oxo-3-oxazolidinyl) phosphinic chloride 1.09 g, 4.3 mmol) was added. After stirring overnight at room temperature (rt), the reaction was quenched with water and extracted into methylene chloride. The organic layer was washed with 0.5 N HCl, water, sodium bicarbonate then water before it was dried over sodium sulfate (Na2SO4) and concentrated. The organic layer was dried over sodium sulfate, concentrated, and purified by MPLC using a Biotage prepacked silica gel cartridge eluting with 3% methanol in methylene chloride (CH2Cl2) to afford 870 mg of an off-white foam. Yield 50%; mp 72 C.; MS (APCI): 401 [M+H]+.
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Reference£º
Patent; Davis, Jamie Marie; Gregory, Tracy Fay; Walters, Michael Anthony; US2004/67960; (2004); A1;,
Isothiazole – Wikipedia
Isothiazole – ScienceDirect.com