Triethylamine → N-(1,1-Diethyl-prop-2-ynyl)-4-[4-(2-methoxy-phenyl)-piperazin-1-yl]-2-phenyl-butyramide

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A mixture of 4-[4-(2-methoxyphenyl)piperazin-1-yl]-2-phenylbutanoic acid (1.772 g, 5 mmole), triethylamine (1.518 g, 15 mmole), and N,N-bis(2-oxo-3-oxazolidinyl)phosphoramidic chloride (1.527 g, 6 mmole) was stirred in methylene chloride (80 mL) under exclusion of moisture at ambient temperature for 30 minutes, after which 1,1-diethylpropargylamine (0.668 g, 6 mmole) was added at once at 0° C. The reaction mixture was stirred at room temperature overnight, washed with water (2×100 mL), dried over magnesium sulfate, filtered, and evaporated to dryness in vacuo. Chromatography on silica gel with methanol/chloroform as eluant, followed by trituration from diethyl ether with addition of ethanolic hydrochloric acid gave 0.6 g of the title compound as the trihydrochloride hemihydrate, m.p. 110°-12° C.

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