Lawesson's reagent → tert-Butyl 2-thioxo-1,4'-bipiperidin-1'-carboxylate

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Reaction Steps

A solution of tert-butyl 2-oxo-1,4′-bipiperidin-1′-carboxylate (2.8 g) and Lawesson's reagent (2.0 g) in toluene (30 mL) was refluxed for one hour. Toluene was distilled off under reduced pressure, and the residue was diluted with dichloromethane, and washed with an aqueous 1N sodium hydroxide solution and saturated saline solution. This dichloromethane solution was dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=2/1 to 1/2) to obtain the title compound (1.9 g, 64%) as a white powder.

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