Diisopropyl Ether → (R)-1-(4-trifluoromethyl-benzenesulfonyl)-piperazine-2-carboxylic acid 4-isopropyl-benzylamide hydrochloride

Participants

Reaction Steps

To a solution of the compound (973 mg) obtained in Step 2 in ethyl acetate (10 ml) was added, with stirring at room temperature, 4N hydrogen chloride/ethyl acetate solution (4.73 ml). After stirring at room temperature for 4 hr, the reaction mixture was concentrated under reduced pressure. Toluene was added to the residue, and the mixture was concentrated again under reduced pressure. The obtained crude crystals were suspended in a mixed solvent of ethyl acetate and diisopropyl ether, collected by filtration and dried to give the title compound (742 mg).

Provenance & Evidence