To a solution of 150 mg 4-[6-Bromo-3-methyl-1-(tetrahydro-pyran-2-yl)-1H-pyrazolo[3,4-b]pyridin-4-ylmethyl]-2,2-diethyl-5,5-dimethyl-piperazine-1-carboxylic acid tert-butyl ester and 48 mg 3-fluoro-4-hydroxy-phenylboronic acid in 8 ml of DEM and 0.45 ml of water were added 40 mg of potassium carbonate. To the degassed reaction mixture 4 mg of bis(tri-tert-butyl-phosphin)palladium(0) were added. The reaction was heated to 120° C. in a microwave reactor for 2 h. The mixture was diluted with ethyl acetate and washed with water. The aqueous phase was extracted with ethyl acetate twice. The combined organic layers were dried and concentrated in vacuo. The resulting residue was purified by HPLC. 53 mg (34%) of the title compound were obtained.
