Triethylamine → HCID 18357998, 화합물

The reaction was carried out as described in Example 47, but using 5 ml of a solution of 1.6 mmol of 6-(1,2-dithiolan-3-yl)hexanoic acid (prepared as described in Example 104) in toluene, 7 ml of anhydrous dimethylformamide, 373 mg of N,N'-carbonyldiimidazole, 0.25 ml of triethylamine and 199 mg of glycine methyl ester hydrochloride. The solvent was removed from the reaction mixture by evaporation under reduced pressure, and water was added to the residue, after which it was extracted with ethyl acetate. The extraction solution was washed with a saturated aqueous solution of sodium chloride and dried over anhydrous sodium sulfate. The ethyl acetate was removed from the extraction solution by evaporation under reduced pressure, and the residue was subjected to silica gel column chromatography, using 2:1 and 3:1 by volume mixtures of ethyl acetate and hexane as the eluent. The residue was then subjected to reverse phase preparative silica gel column chromatography, using 2:3 and 1:1 by volume mixtures of acetonitrile and water as eluent, and the acetonitrile was removed from the solution by evaporation under reduced pressure, after which the residue was extracted with ethyl acetate. The extraction solution was washed with a saturated aqueous solution of sodium chloride and dried over anhydrous sodium sulfate. The ethyl acetate was removed from the extraction solution by evaporation under reduced pressure, and the residue was dissolved in dioxane and then lyophilised, to obtain 61 mg of the title compound as a pale yellow amorphous substance having an Rf value of 0.28 (silica gel thin layer chromatography; using 2:1 by volume mixture of ethyl acetate and hexane as developing solvent).