Phenylacetyl chloride → N-{[9-[(2R,3R,4S,5R)-3,4-Dihydroxy-5-(methoxymethyl)tetrahydro-2-furanyl]-6-[(2,2-diphenylethyl)amino]-9H-purin-2-yl]methyl}-2-phenylacetamide

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Reaction Steps

A stirred solution of (2R,3R,4S,5R)-2-{2-(aminomethyl)-6-[(2,2-diphenylethyl)amino]-9H-purin-9-yl}-5-(methoxymethyl)tetrahydro-3,4-furandiol (example 1) (220 mg, 0.45 mmol) in dichloromethane (10 ml) was treated with triethylamine (0.38 ml, 2.70 mmol) and phenylacetylchloride (280 mg, 1.80 mmol) at 0° C. and the resultant mixture stirred for 15 min. The mixture was then stirred at room temperature for 72 hr. The solvent was removed under reduced pressure and methanol (20 ml), saturated with ammonia gas, added. The resultant mixture was stirred at room temperature for 2 hr, treated with 2 molar aqueous sodium hydroxide (10 ml) and then left standing at room temperature for 24 hr. The methanol was removed under reduced pressure and the aqueous layer extracted with dichloromethane (×3). The combined organic layers were washed with water (×2), dried with anhydrous magnesium sulfate, filtered and the solvent removed under reduced pressure. The residue was dissolved in 1,4-dioxan (6 ml), 0.88 aqueous ammonia solution (8 ml) added and the mixture stirred at room temperature for 10 days. The 1,4-dioxan was removed under reduced pressure and the aqueous layer extracted with dichloromethane (×3).

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