Diisopropylethylamine → 6-N-acetyl-5'-O-(4,4'-dimethoxytrityl)-2'-O-(2-cyanoethoxymethyl)adenosine

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N6-Acetyl-5′-O-(4,4′-dimethoxytrityl)adenosine (22.0 g, 36.0 mmol) was dissolved in 170 mL of 1,2-dichloroethane, and 16.3 g of diisopropylethylamine (126 mmol) was added, and 12.1 g of dibutylstannyl dichloride (39.7 mmol) was added subsequently. Then, the reaction was performed at room temperature for 1 hour. Then, the reaction solution was heated up to 80° C., and 4.30 g of chloromethyl 2-cyanoethyl ether (36.0 mmol) was added dropwise, and the solution was stirred for 30 minutes. After the reaction completed, the reaction solution was added to an aqueous saturated sodium bicarbonate solution, and was subjected to extraction with methylene chloride. The extract was dried over anhydrous magnesium sulfate, and the solvent was distilled off. The obtained mixture was purified by silica gel column chromatography to obtain N6-acetyl-5′-O-(4,4′-dimethoxytrityl)-2′-O-(2-cyanoethoxymethyl) adenosine (7.47 g, yield 33%).

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