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

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To 800 mL of an aqueous pH 6.0, 50 mM citrate buffer, prepared as described in Example 2c. was added 2-amino-6-isopropoxypurine (0.159 g, 0.8 mmol) and 3'-azido-3'-deoxythymidine (1.069 g, 4.0 mmol). Solution was achieved by heating the mixture at 50° C. with sonication. A sample was removed as a control. A 40 mL solution of trans-N-deoxyribosylase (Example 2b) with an activity of 1500 units/mL was added. The reaction was heated at 50° C. Six days later, 0.159 g, 0.8 mmol, of 2-amino-6-isopropoxypurine was added to the reaction. Fifteen days after the reaction was started, another 0.159 g, 0.8 mmol, of 2-amino-6-isopropoxypurine and 0.428 g, 1.6 mmol, of 3'-azido-3'-deoxythymidine were added to the reaction. Twenty-seven days after the reaction was started, 0.159 g, 0.58 mmoles, of 2-amino-6-isopropoxypurine was added to the reaction. The reaction was stopped after thirty-three days. The reaction was heated at 80° C. to precipitate the enzyme and 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 basic alumina grade 1 eluted with chloroform/methanol (95:5, v/v). The product containing fractions were combined and the solvent removed in vacuo to give the product as a foam (28% yield). mp=195°-197° C.

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