tert-butyl (3S)-1-(6-(5-bromo-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[3,4-c]pyridin-3-yl)pyridin-2-yl)piperidin-3-ylcarbamate 、
叔丁脲 以to afford 20 mg (23%) of 298 over three steps的产率得到(S)-1-(3-(6-(3-aminopiperidine-1-yl)pyridin-2-yl)-1H-pyrazolo[3,4-c]pyridine-5-yl)urea