Hydrochloric Acid → 3-(Phenylsulfonyl)-4-piperazin-1-yl-1H-indazole Hydrochloride

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A solution of 4-[4-(t-butoxycarbonyl)piperazin-1-yl]-3-(phenylsulfonyl)-1H-indazole (0.022 g, 0.050 mmol) in methanol is treated with a 2 M solution of HCl in ether (0.4 mL), heated at reflux temperature for 1 h, cooled to room temperature and evaporated to dryness. The residue is re-dissolved in methanol and concentrated. Repeating this procedure three more times affords the title product as a white solid, 0.009 g (40% yield), identified by NMR and mass spectral analyses.

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