Piperidine → (R)-2-(4-propyl-benzylcarbamoyl)-4-thiocarbamoyl-piperazine-1-carboxylic acid benzyl ester

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Reaction Steps

To a solution of the compound (1.59 g) obtained in Step 3 in chloroform (16 ml) was added, with stirring at room temperature, triethylamine (840 μl), and 9-fluorenylmethoxycarbonyl isothiocyanate (1.13 g) was added. After stirring at room temperature for 4 hr, piperidine (805 μl) was added. After stirring overnight at room temperature, the reaction mixture was concentrated under reduced pressure. The residue was partitioned by adding ethyl acetate and water. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, filtrated, and concentrated under reduced pressure. The residue was purified by column chromatography (ethyl acetate:n-hexane=1:1-4:1) to give the title compound (1.62 g).

Provenance & Evidence