1,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride → (R)-3-(3-fluoro-4-trifluoromethoxy-benzylcarbamoyl)-4-(4-trifluoromethyl-benzenesulfonyl)-piperazine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a solution of the compound (1.24 g) obtained in Example 1001, Step 1 in N,N-dimethylformamide (12 ml) were added, with stirring under ice-cooling, 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (0.65 g), 1-hydroxybenzotriazole hydrate (0.52 g) and the compound (0.59 g) obtained in Step 3. After stirring overnight at room temperature, the reaction mixture was partitioned by adding saturated aqueous sodium hydrogen carbonate solution and ethyl acetate. The organic layer was washed successively with water and saturated brine, dried over anhydrous sodium sulfate, filtrated, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (methanol:chloroform=4:96-6:94) to give the title compound (1.70 g).

Provenance & Evidence