Trifluoroacetic acid → 1-(6-Chloro-pyridin-3-yl)-homopiperazine

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A mixture of 1-(6-chloro-3-pyridyl)-4-tert-butoxycarbonyl homopiperazine (1.7 g, 5.5 mmol), trifluoro acetic acid (4.5 ml, 55 mmol) and dichloromethane at room temperature for 1 h. The mixture was evaporated. Chromatography on silica gel with a mixture of petroleum:ethyl acetate (1:1) gave the title compound as free base. The corresponding salt was obtained by addition of a diethyl ether and methanol mixture (9:1) saturated with fumaric acid. Mp 165-167° C. Yield 0.72 g, 40%.

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