Trifluoroacetic acid → (3S)-3-methyl-1-pyridin-2-ylpiperazine

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Reaction Steps

To a solution of (S)-tert-butyl 2-methyl-4-(pyridin-2-yl)piperazine-1-carboxylate (5.2 g, 18.75 mmol,) in dichloromethane (30 ml) was added trifluoroacetic acid (5 ml). After stirring overnight at room temperature, the pH was adjusted to 8 with an aqueous sodium carbonate solution, extracted with dichloromethane (3×150 ml), dried over anhydrous magnesium sulfate and concentrated under vacuum to afford (S)-3-methyl-1-(pyridin-2-yl)piperazine as yellow oil (3.1 g, 93%).

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