Cl[C:2]1[N:7]=[C:6]([CH3:8])[N:5]=[C:4]2[NH:9][N:10]=[CH:11][C:3]=12.C(N(CC)CC)C.[H][H].C(OCC)(=O)C>O1CCOCC1.[OH-].[OH-].[Pd+2]>[CH3:8][C:6]1[N:5]=[C:4]2[NH:9][N:10]=[CH:11][C:3]2=[CH:2][N:7]=1
4.464 g (approx. 24.28 mmol, purity 92%) of 4-chloro-6-methyl-1H-pyrazolo[3,4-d]pyrimidine was dissolved in 180 ml dioxane and 2.948 g (29.14 mmol) of triethylamine and 5.629 g of 20% palladium hydroxide on charcoal were added and it was hydrogenated at 3 bar hydrogen pressure and RT for 2 days. 100 ml ethyl acetate, 2.948 g (29.14 mmol) of triethylamine and 2.000 g of 20% palladium hydroxide on charcoal were added. The mixture was hydrogenated with hydrogen at 3 bar hydrogen pressure and RT for 3 h. The reaction mixture was filtered on Celite, washed with a little dioxane/ethyl acetate and the filtrate was concentrated in the rotary evaporator. 2.180 g (purity 73%, 49% of theor.) of the target compound was obtained.
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