Potassium Iodide → 4-(2-Methoxy-5-trifluoromethyl-phenyl)-piperazine

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Reaction Steps

A mixture of 6.65 g of 2-methoxy-5-trifluoromethylaniline, 6.21 g of bis-(2-chloroethyl)amine hydrochloride, 4.71 g of anhydrous potassium carbonate and 0.34 g of anhydrous potassium iodide in 70 mL of n-butanol was refluxed for 50 hours. The solvent was removed at reduced pressure and the residue was taken up in 400 mL of diethyl ether. The suspension was acidified with 3N anhydrous hydrogen chloride in diethyl ether and stirred at room temperature for 3 hours. The solid was collected by filtration and dissolved in 50 mL of water. The solution was acidified with 36% hydrochloric acid, washed with 3×50 mL of diethyl ether, alkalinised with excess 36% sodium hydroxide and extracted with 2×70 mL of diethyl ether. The organic layer was dried over sodium sulphate and evaporated to dryness at reduced pressure to give a residue which was purified twice by flash chromatography, first using chloroform/3N methanolic ammonia 100:3 and subsequently using the upper layer of a 4:5:1 mixture of water, n-butanol and glacial acetic acid. The solvents were removed by evaporation in vacuo to give a residue which was dissolved in water. The mixture was alkalinised with 2N sodium hydroxide and extracted with chloroform; the organic layer was dried over sodium sulphate and the solvent was removed under reduced pressure to afford 1.42 g (16%) of Compound 17A as an oil.

Provenance & Evidence