Triethylamine → N-[2-(2-methyl-1H-imidazol-1-yl) ethyl]adenosine, hydrochloride

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反応手順

A suspension was prepared containing 1.64 g (5.74 mmol) of 6-chloropurine riboside in 12 ml of absolute ethanol. To the solution was added 0.72 g (5.7 mmol) of 2-(2-methyl-imidazol-1-yl) ethylamine (prepared in accordance with Z.Obsch. Chim. 11, 545 (1941); Chem Ab. 1941 6938) and 0.81 g (8.0 mmol) of triethylamine. The reaction mixture was heated under reflux for 77 hours. The solvent was removed in vacuo and chromatography of the residue on silica gel was performed by eluting with a mixture of 22 parts methanol, 88 parts methylene chloride, and one part ammonium hydroxide. The title compound was obtained as the free base yielding 1.2 g (55% yield). This material was converted to the hydrochloride salt by suspending in 20 ml of water at 0° and adding 1 normal hydrochloric acid until a pH of 2.6 was attained. The solution was frozen and lyophilized giving a white powder which was passed through a column of cellulose powder eluting with a mixture of 85 parts n-butanol and 15 parts water. The appropriate fractions were combined and concentrated to give a glass which was azeotroped twice with water and then dissolved in water, frozen and lyophilized giving 1.1 g (44% yield) of the title compound as a white powder.

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