Trifluoroacetic acid → N-{4-[(3S)-3-Aminopiperidin-1-yl]-7-hydroxy-6,7-dihydro-5H-cyclopenta[b]pyridin-3-yl}-6-[2,6-difluoro-4-(methylthio)phenyl]-5-fluoropyridine-2-carboxamide

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Reaction Steps

4-{(3S)-3-[(tert-Butoxycarbonyl)amino]piperidin-1-yl}-3-[({6-[2,6-difluoro-4-(methylthio)phenyl]-5-fluoropyridin-2-yl}carbonyl)amino]-6,7-dihydro-5H-cyclopenta[b]pyridin-7-yl acetate (6.3 mg, 0.009 mmol) was dissolved in MeOH (0.1 mL) and THF (0.06 mL), then 1.0 M aq. NaOH (0.038 mL, 0.038 mmol) was added. The reaction mixture was stirred at room temperature for 20 min. The organic solvents and trace of water were removed under reduced pressure to give a crude intermediate. The residue was dissolved in DCM (0.1 mL) and then TFA (0.095 mL, 1.2 mmol) was added. The reaction mixture was stirred at room temperature for 20 min., then the solution was evaporated under reduced pressure. The residue was diluted with MeOH, filtered and purified by preparative LC-MS (XBridge™ preparative C18 5 μm OBD™ column, 30×10 mm, 60 mL/min., eluting with a gradient of MeCN and water with 0.1% NH4OH) to give both diastereoisomers of the title compound as white powders. On analytical HPLC (Waters SunFire™ C18, 2.1×50 mm, 5 μm; flow rate 3 mL/min.; injection volume 2 μL; gradient from 2 to 80% B in 3 minutes (A=water with 0.025% TFA, B=MeCN)), the diastereoisomers of the product had the following properties:

Provenance & Evidence