Triethylamine → 1-[5-(3,4,5-Trimethoxyphenyl)-2,4-pentadienoyl]-4-(methylaminocarbonylmethyl)-piperazine

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To a solution of 302 mg of 1-[5-(3,4,5-trimethoxyphenyl)-2,4-pentadienoyl]-piperazine in dry toluene (12 ml) were added in an atmosphere of argon 1.3 ml of triethylamine and subsequently a solution of 254 mg of N-methylchloroacetamide in dry toluene-chloroform (1:1, 2 ml). The mixture was refluxed for 8 hours. To the reaction mixture was added water, and extraction was made with methylene chloride. The organic layer was concentrated under reduced pressure, and the residue thus obtained was chromatographed on silica gel column. There was obtained 263 mg of 1-[5-(3,4,5-trimethoxyphenyl)-2,4-pentadienoyl]-4-(methylaminocarbonylmethyl)-piperazine. Spectrophotometric data of the product support the structure of the formula (V) shown below. ##STR5##

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