(2S,3S,4R,5R)-5-[6-[(2,2-Diphenylethyl)amino]-2-({4-[(trifluoroacetyl)amino]-1-piperidinyl}carbonyl)-9H-purin-9-yl]-N-ethyl-3,4-dihydroxytetrahydro-2-furancarboxamide → (2S,3S,4R,5R)-5-{2-[(4-amino-1-piperidinyl)carbonyl]-6-[(2,2-diphenylethyl)amino]-9H-purin-9-yl}-N-ethyl-3,4-dihydroxytetrahydro-2-furancarboxamide

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A solution of (2S,3S,4R,5R)-5-[6-[(2,2-diphenylethyl)amino]-2-({4-[(trifluoroacetyl)amino]-1-piperidinyl}carbonyl)-9H-purin-9-yl]-N-ethyl-3,4-dihydroxytetrahydro-2-furancarboxamide (Preparation 40) (40 mg, 0.056 mmol) in methanol (1 ml) and concentrated aqueous ammonia solution (0.5 ml) was stirred at room temperature for 48 hours. Solvent was removed by evaporation under reduced pressure to give the target compound as a white solid, (35 mg).

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