反应详情

1,1-dimethylethyl (2S)-2-methyl-4-{[2-methyl-5-(trifluoromethyl)phenyl]sulfonyl}-1-piperazinecarboxylate (may be prepared as described in Description 26) (2.1 g, 4.97 mmol) in 1,4-Dioxane (50 mL) was treated by 4 M HCl 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. 4 M HCl in dioxane (6.21 mL, 24.85 mmol) was added and the reaction mixture stirred for 4 h. LCMS showed about 10% of remaining starting material. 4 M HCl in dioxane (6.21 mL, 24.85 mmol) was added and the reaction mixture stirred for 1 h.