2-Ethoxy-1-(ethoxycarbonyl)-1,2-dihydroquinoline → HCID 69827870, compound

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A solution of (3aS,4S,6R,6aR)-6-(6-cyclopentylamino-purin-9-yl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxole-4-carboxylic acid (3.018 g) and 2-ethoxy-1-ethoxycarbonyl-1,2-dihydroquinoline (2.66 g) in methanol (120 ml) was heated under reflux for 17 h. The resulting mixture was concentrated in vacuo and the residue dissolved in ethyl acetate (150 ml). The solution was washed with 0.5M aqueous citric acid solution (3×25 ml) and brine (50 ml), dried (magnesium sulphate), and evaporated in vacuo to give a white foam. Purification by column chromatography on silica gel, eluting with ethyl acetate:cyclohexane (1:1), gave the title compound as a white solid (2.32 g).

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