Citrate → [(2S,3S,5R)-5-[2-amino-6-(dimethylamino)purin-9-yl]-3-azido-tetrahydrofuran-2-yl]methanol

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To 500 mL of an aqueous pH 6.0, 50 mM citrate buffer, prepared as described in Example 2c, was added 2-amino-6-dimethylaminopurine (0.0891 g, 0.5 mmol) and 3'-azido-3'-deoxythymidine (0.668 g, 2.5 mmol). Solution was achieved by heating the mixture at 50° C. with sonication. A sample was removed as a control. A 24 mL solution of trans-N-deoxyribosylase (Example 2b) at an activity of 1400 units/mL was added. The reaction was heated at 50° C. Seven days later 0.0891 g, 0.5 mmol, of 2-amino-6-dimethylamino purine was added to the reaction. The reaction was terminated after fourteen days. The reaction was heated to 80° C. to precipitate the enzyme and then filtered. The aqueous solution was extracted with ethyl acetate to remove the product. The combined ethyl acetate fractions were dried with magnesium sulfate, filtered, and the solvent was removed in vacuo to give a foam. The foam was chromatographed on 90 g of silica gel eluted with chloroform/methanol (97:3, v/v). Chromatography a second time on silica gel (230-400 mesh) eluted with chloroform/methanol (98:2, v/v) gave pure product. The product containing fractions were combined and the solvents removed in vacuo to give the product as a solid (41% yield).

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