Hydrochloric Acid → 4-[5-Ethyl-2-(4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl)-N-methylnicotinamido]butyric acid

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Reaction Steps

A stirred solution of 7-ethyl-2-isopropyl-2-methyl-5H-imidazo[1',2':1,2]pyrrolo[3,4-b]pyridine-3(2H),5-dione (5.47 g, 20.19 mmol) in anhydrous N,N-dimethylformamide is treated successively with 4-(methylamino)butyric acid hydrochloride (3.29 g, 21.2 mmol) and triethylamine (4.29 g, 42.39 mmol). The resulting mixture is stirred at room temperature under nitrogen for 2.5 hours. After this period, the reaction mixture is diluted with water, acidified with concentrated hydrochloric acid and extracted with ether. The organic extract is dried over magnesium sulfate, vacuum filtered through diatomaceous earth and concentrated in vacuo to give the title product as a white solid, mp 42°-49° C. (dec.).

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