Sodium hydride → N-benzoyl-N-(p-tert-butylbenzyl)-5'-O-(4,4'-dimethoxytrityl)-2'-deoxyadenosine

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To N6 -benzoyl-5'-O-(4,4'-dimethoxytrityl)-2'-deoxyadenosine (658 mg, 1.0 mmole) was added DMF (anhydrous, 10 ml) and evaporated to dryness. This was repeated. Fresh DMF (10 ml) was added under an Argon atmosphere. Sodium hydride (44 mg, 60% in oil, 1.1 mmole) was added and the mixture was stirred for 0.5 hour at room temperature. 4-(tert-butyl)benzyl bromide (272 mg, 1.2 mmole) was added dropwise and stirred at room temperature overnight. The solvent was removed under vacuum, and the residue was partitioned between ethyl acetate and water (20 ml each). The organic phase was washed with water (3 times, 20 ml), dried over anhydrous magnesium sulfate, filtered and evaporated to dryness. The crude product was purified by column chromatography on silica gel (100 g), using methylene chloride:methanol:triethylamine 96.5:3:0.5 to yield N -benzoyl-N -(p-tert-butylbenzyl)-5'-O-(4,4'-dimethoxytrityl)-2'-deoxyadenosine, (229 mg, 28.5%).

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