A mixture of 2-fluoro-4-methanesulfonyl-phenol (Intermediate 1; 20 mg, 0.1 mmol), 4-chloro-1-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)-piperidin-4-yl]-1H-pyrazolo[3,4-d]pyrimidine (Intermediate 22; 31 mg, 0.09 mmol) and potassium carbonate (14 mg, 0.1 mmol) in DMF (2 mL) was heated in a Biotage Optimizer microwave at 180° C. for 10 min. The mixture was cooled and filtered through Celite, concentrated and held under vacuum. The residue was purified on a silica column (ISCO 4 g) eluting with 0-3% methanol/dichloromethane to give 4-(2-fluoro-4-methanesulfonyl-phenoxy)-1-[1-(3-isopropyl-[1,2,4]oxadiazol-5-yl)-piperidin-4-yl]-1H-pyrazolo[3,4-d]pyrimidine (6 mg, 14%). Mass spectrum (ES) MH+=502.
