(R)—N-Ethyl-N-(6-(3-(1-phenylethyl)ureido)-1H-pyrazolo[4,3-c]pyridin-3-yl)acetamide (154 mg, 0.420 mmol) was dissolved in DMA (1 mL) and methanol (1 mL), charged with powdered Selectfluor® (164 mg, 0.462 mmol), and stirred at room temperature overnight. The reaction was then to heated to 55° C. for 8 h. The resulting crude residue was purified by mass-triggered reverse phase HPLC. Fractions containing pure compound were filtered through a PS-HCO3 cartridge and the filtrate was concentrated in vacuo to give (R)-1-(3-(ethylamino)-7-fluoro-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea. MS ESI calc'd. for C19H21FN6O2 [M+1]+ 385. found 385.
