反应详情

To a mixture of 1-cyclopentyl-3-ethyl-5-amino-1H-pyrazole-4-carboxamide (2.0 g, 9.0 mmol), DMF (30 ml), and 3-ethoxy-4-cyanopyridine (1.47 g, 9.9 mmol) under argon was added sodium hydride (0.43 g, 10.8 mmol). The mixture was stirred at room temperature for 24 hours and the solvent was removed in vacuo. The residue was treated with water, acidified with acetic acid and a precipitate formed which was collected by filtration. The residue was purified by column chromatography on silica eluting with ether (100%) to acetone (100%) to afford 1.4 g (44%) of 1-cyclopentyl-3-ethyl-6-(3-ethoxy-4-pyridyl)pyrazolo[3,4-d]-pyrimidin-4-amine.

1. customthe solvent was removed in vacuo
2. additionThe residue was treated with water
3. customa precipitate formed which
4. filtrationwas collected by filtration
5. customThe residue was purified by column chromatography on silica eluting with ether (100%) to acetone (100%)