Water → Ethyl 4-(2,5-dichlorobenzyl)piperazine-1-carboxylate

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Reaction Steps

To a mixture comprising 1.94 g 1-ethoxycarbonylpiperazine and 3.45 g anhydrous potassium carbonate, in 20 mL of N,N-dimethylformamide, stirred at room temperature, under a nitrogen atmosphere, there was added 2.01 g of 2,5-dichlorobenzyl chloride. Then after 24 hr stirring at room temperature, this reaction mixture was poured into 200 mL of water, followed by extraction with ethyl acetate (3×100 mL). The obtained organic phase was dried over anhydrous sodium sulphate, followed by evaporation under vacuum. The obtained residue was then purified by flash chromatography (petroleum ether—ethyl acetate 85:15). The solvents were then evaporated off completely to give 2 g of Compound 14A (yield 63%).

Provenance & Evidence