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A mixture of 1.268 g (5 mmol) of ethyl 4-chloro-1,3-dimethyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate and 7.5 ml (15 mmol) of methylamine in tetrahydrofuran (2.0 molar solution) was stirred at room temperature overnight and refluxed for 2 hours. The solvent was removed to give a white solid. The solid was dissolved in ethyl acetate and the solution washed with H2O, 1M NaHCO3, brine and dried (Na2SO4). The solvent was removed to give a white solid. Crystallization from ethyl acetate gave 0.715 g of white solid; Mass spectrum (ES) 249.2 (M+H).

1. temperaturerefluxed for 2 hours
2. customThe solvent was removed
3. customto give a white solid
4. washthe solution washed with H2O, 1M NaHCO3, brine
5. dry with materialdried (Na2SO4)
6. customThe solvent was removed
7. customto give a white solid
8. customCrystallization from ethyl acetate