Dicyclohexylcarbodiimide → N-[p-(3-methylbutoxy)benzyl]-2-(3-pyridyl)thiazolidine-4-carboxamide

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Reaktionsschritte

A mixture of 1.13 g of p-(3 methylbutoxy)benzylamine, 1.29 g of 2-(3-pyridyl)thiazolidine-4-carboxylic acid, 1.25 g of dicyclohexylcarbodiimide and 0.82 g of 1-hydroxybenzotriazole in 20 ml of N,N-dimethylformamide was stirred overnight at room temperature. The reaction mixture was diluted with 100 ml of ethyl acetate, and the insoluble matter was filtered off. The filtrate was washed in sequence with saturated aqueous solution of sodium hydrogen carbonate, water and saturated aqueous solution of sodium chloride, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure Purification of the thus-obtained residue by silica gel column chromatography (eluent: ethyl acetate) gave 2.20 g of N-[p-(3-methylbutoxy)benzyl]-2-(3-pyridyl)thiazolidine-4-carboxamide. To a solution of this compound in 60 ml of ethyl acetate was added 4 ml of 4N hydrogen chloride solution in dioxane. The precipitate solid was collected by filtration, washed with ethyl acetate and dried under reduced pressure to give 2.30 g of N-[p-(3-methylbutoxy)benzyl]-2-(3-pyridyl)thiazolidine-4-carboxamide dihydrochloride. Melting point 120°-128° C.

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