Hydrochloric Acid → (2S)-2-Methyl-1-{[4-(trifluoromethyl)phenyl]sulfonyl}piperazine hydrochloride

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To a solution of 1,1-dimethylethyl (3S)-3-methyl-4-{[4-(trifluoromethyl)phenyl]sulfonyl}-1-piperazinecarboxylate (may be prepared as described in Description 7) (4.4 g, 10.77 mmol) in 1,4-dioxane (30 ml) was added HCl (4M in 1,4-dioxane) (5.39 ml, 21.55 mmol) and the mixture stirred at room temperature for 2 hours. A further portion of HCl (4M in 1,4-dioxane) (16.16 ml, 64.6 mmol) was then added and the mixture stirred for a further 16 hours. The volatiles were then removed in vacuo giving the title compound (3.8 g) as a white solid.

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