Hydrochloric Acid → Benzyl 2-(2-(pyridin-3-yl)ethyl)piperazine-1-carboxylate dihydrochloride

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Reaction Steps

4 M HCl in 1,4-dioxane (6 mL, 24 mmol) was added to a solution of 1-benzyl 4-tert-butyl 2-(2-(pyridin-3-yl)ethyl)piperazine-1,4-dicarboxylate (130.2 mg, 0.306 mmol) in MeOH (1 mL). After 1 h, the reaction mixture was concentrated under reduced pressure and purified by HPLC (5 to 50% MeCN/0.1% TFA in H2O/0.1% TFA gradient). The fractions containing the desired product were concentrated under reduced pressure. The material was dissolved in MeOH (1 mL) and 4 M HCl in 1,4-dioxane (0.015 mL) was added. The mixture was concentrated under reduced pressure to give 71.0 mg (58%) of the desired product. LC-MS: RT=3.50 min, [M+H]+=326.2.

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