A 10 mL microwave tube was charged with 3-bromo-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidine (0.3 g, 1.22 mmol), K2CO3 (0.51 g, 3.66 mmol), and DMSO (2 mL). The mixture was stirred for 20 min before 4-(bromomethyl)cyclohexylcarbamate (0.45 g, 1.53 mmol) and THF (4 mL) was added. The resulting mixture was heated at 150° C. for 10 minutes in microwave. The reaction mixture was poured into water and extracted with Et2O (3×). The combined ether layer was dried (Na2SO4) and concentrated. The crude mixture was purified by Isco to provide tert-butyl 4-((3-bromo-6-(methylthio)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)methyl)cyclohexylcarbamate (0.46 g, 83%) as a white solid. MS m/z 478.10 [M+Na]+.
