Sulfuric Acid → 5-(5-Acetyl-2-butoxy-3-pridinyl)-2-[2-(dimethylamino)ethyl]-3-ethyl-2,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one

Beteiligte Stoffe

Reaktionsschritte

1 N Sulfuric acid (1 mL) was added to a stirred solution of 5-(2-butoxy-5-ethynyl-3-pyridinyl)-2-[2-(dimethylamino)ethyl]-3-ethyl-2,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one (Example 46) (280 mg, 0.69 mmol) in acetone (8 mL) at room temperature. Mercury sulfate (40 mg, 0.14 mmol) was added and the mixture heated at reflux for 5 h. The reaction mixture was cooled, diluted with methanol (10 mL), filtered and the filtrate washed with further methanol. The solvent was evaporated and the residue partitioned between ethyl acetate (100 mL) and saturated sodium bicarbonate solution (100 mL). The aqueous was washed with a further 100 mL of ethyl acetate and the combined organics dried (MgSO4) and concentrated. Purification by flash column chromatography (elution with 95% dichloromethane/methanol) gave the product as a cream coloured solid (140 mg).

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