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

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Reaction Steps

To a solution of 1,1-dimethylethyl(3R)-3-methyl-4-{[4-(trifluoromethyl)phenyl]sulfonyl}-1-piperazinecarboxylate (may be prepared as described in Description 3) (3.39 g, 8.30 mmol) in 1,4-dioxane (20 ml) was added HCl (4M in 1,4-dioxane) (10.4 ml, 41.5 mmol) and the resultant mixture stirred under an atmosphere of Ar for 16 hours. A further 5 ml of 4M HCl in dioxane was added and the mixture stirred at rt for 72 hours. The mixture was concentrated to dryness and the residue triturated with diethyl ether and the solid collected by filtration giving the title compound (2.51 g) as a white powder.

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