Iodine → (2S,3S,4R,5R)-4-(Benzoyloxy)-5-{2-cyano-6-[(2,2-diphenylethyl)amino]-9H-purin-9-yl}-2-[(ethylamino)carbonyl]tetrahydro-3-furanyl benzoate

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A mixture of 6-[(2,2-diphenylethyl)amino]-9H-purine-2-carbonitrile (Preparation 24) (5.00 g, 14.7 mmol), (2S,3S,4R,5R)-5-(acetyloxy)-4-(benzoyloxy)-2-[(ethylamino)carbonyl]tetrahydro-3-furanyl benzoate and (2S,3S,4R,5S)-5-(acetyloxy)-4-(benzoyloxy)-2-[(ethylamino)carbonyl]tetrahydro-3-furanyl benzoate (Preparation 18) (6.50 g, 14.7 mmol) and iodine (0.38 g, 15.0 mmol) were heated together at 150° C. under reduced pressure (7 kPa, 1 psi) for 2.5 hours. The reaction was then allowed to stand at room temperature for 18 hours. The residue was purified by column chromatography on silica gel eluting with a gradient system of ethyl acetate:pentane (40:60 by volume) increasing in polarity to neat ethyl acetate to afford the title compound as a foam (4.95 g).

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