Hydrochloric Acid → (3S)-3-methyl-1-{[2-methyl-5-(trifluoromethyl)phenyl]sulfonyl}piperazine

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Reaction Steps

1,1-dimethylethyl(2S)-2-methyl-4-{[2-methyl-5-(trifluoromethyl)phenyl]sulfonyl}-1-piperazinecarboxylate (may be prepared as described in Description 20) (2.1 g, 4.97 mmol) in 1,4-Dioxane (50 mL) was treated by HCl 4M in dioxane (6.21 mL, 24.85 mmol). The reaction mixture was stirred overnight at room temperature. LCMS showed a 1:1 ratio between starting material and expected product. HCl 4M in dioxane (6.21 mL, 24.85 mmol) is added and the reaction mixture stirred for 4 h. LCMS showed about 10% of remaining starting material. HCl 4M in dioxane (6.21 mL, 24.85 mmol) is added and the reaction mixture stirred for 1 h.

Provenance & Evidence