Potassium Carbonate → 6-Acetoxy-1-(2-morpholin-4-yl-ethyl)-5-oxo-1,5-dihydro-imidazo[1,2-a]pyrimidine-7-carboxylic acid methyl ester

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Reaction Steps

The product from Example 18.1.1.2 (30 mg, 0.12 mmol) and 18-crown-6 (3 mg, 10% w/w) were mixed with acetonitrile (5 mL) at room temperature. To this stirred solution was added anhydrous potassium carbonate (83 mg, 0.60 mmol) and 4-(2-chloroethyl)-morpholine hydrochloride (25 mg, 0.132 mmol). The mixture was heated at reflux for 2 h and then cooled down to room temperature. The reaction was concentrated to near dryness in vacuo and ethyl acetate (15 mL) was added and the mixture washed with water (2×10 mL). The organic layer was separated, dried and concentrated in vacuo and the residue was purified by column chromatography using dichloromethane/methanol (20:1) as eluent. 6-Acetoxy-1-(2-morpholin-4-yl-ethyl)-5-oxo-1,5-dihydro-imidazo[1,2-a]pyrimidine-7-carboxylic acid methyl ester (15 mg, 34%) was obtained as a white solid.

Provenance & Evidence