Trifluoroacetic acid → 1-[2-(7-Methoxy-quinoxalin-2-ylsulfanyl)-ethyl]-piperidin-4-ylamine

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Reaction Steps

Trifluoroacetic acid (5.41 mL, 70.2 mmol, 15.0 eq) is added at 0° C. to a stirred solution of {1-[2-(7-methoxy-quinoxalin-2-ylsulfanyl)-ethyl]-piperidin-4-yl}-carbamic acid tert-butyl ester (2.0 g, 4.68 mmol, 1.0 eq) in dichloromethane (200 mL). After 15 hours stirring at room temperature, the reaction mixture is extracted with dichloromethane (3×50 mL) and water (50 mL) and the pH value adjusted to 12 by the addition of a 1N sodium hydroxide aqueous solution. The combined organic layers are dried over sodium sulfate, filtered and concentrated to afford 1-[2-(7-methoxy-quinoxalin-2-ylsulfanyl)-ethyl]-piperidin-4-ylamine as an orange oil (1.40 g, 92% yield).

Provenance & Evidence