Potassium Carbonate → 2-[(2-Cyclopropylethyl)oxy]-8-(methoxy)-9-(tetrahydro-3-furanylmethyl)-9H-purin-6-amine

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A stirring mixture of 2-[(2-cyclopropylethyl)oxy]-8-(methoxy)-1H-purin-6-amine trifluoroacetic acid salt (2.89 g), potassium carbonate (4.41 g) and dry DMF (32 ml) was heated at 60° C. under nitrogen for 90 minutes. Tetrahydro-3-furanylmethyl methanesulfonate (1.869 g, isomer 1) was then added and stirring continued at 70° C. for 1 h, then at 90° C. for 2 h. The solvent was evaporated and the residue treated with water and extracted three times with ethyl acetate. The combined extracts were washed with water then brine, dried by passing through a hydrophobic frit and evaporated to a brown oil. This was purified on a 360 gm C18 column using water (+0.1% formic acid)/acetonitrile (+0.05% formic acid). Appropriate fractions were combined and evaporated, yield 814 mg.

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