To 1-ethyl-5-[methoxy-(1H-pyrrolo[2,3-b]pyridin-3-yl)-methyl]-1H-pyrazol-3-yl-(4-fluoro-benzyl)-amine (531, 0.12 g, 0.32 mmol) in acetonitrile (10.0 mL, 0.191 mol) were added triethylsilane (0.60 mL, 0.0038 mol) and trifluoroacetic acid (0.30 mL, 0.0039 mol). The reaction was stirred at 80° C. for 2 hours. The reaction was poured into aqueous potassium carbonate and extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated and washed with ethyl acetate and hexane to give crude compound. 1H NMR indicated that the reaction was incomplete. The crude compound was dissolved in dichloromethane (15.0 mL), trifluoroacetic acid (0.30 mL) and triethylsilane (0.60 mL). The reaction was stirred at 43° C. for 72 hours. The reaction was concentrated, poured into aqueous potassium carbonate and extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated and washed with ethyl acetate and hexane to give an off-white solid (P-0165, 18.7 mg, 17%). MS (ESI) [M+H+]+=350.3.
