Trifluoroacetic acid → (R)-1-(3-(4-fluorophenyl)-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea

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Reaction Steps

To the solution of (R)-1-(3-(4-fluorophenyl)-1-trityl-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea (61 mg, 0.10 mmol) in DCM (0.5 mL) was added TFA (0.5 mL) and triethylsilane (0.05 mL, 0.313 mmol). The mixture was stirred at room temperature for 10 min, concentrated in vacuo and purified on reversed phase HPLC to afford (R)-1-(3-(4-fluorophenyl)-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea (40 mg, 0.083 mmol, 83%) as a yellow solid. MS ESI calcd. for C21H19FN5O [M+H]+ 376, found 376. 1H NMR (600 MHz, DMSO-d6) δ 13.24 (s, 1H), 9.12 (s, 1H), 9.06 (s, 1H), 8.04 (dd, J=8.8, 5.5 Hz, 2H), 7.75 (s, 1H), 7.65 (s, 1H), 7.39-7.27 (m, 6H), 7.22-7.18 (m, 1H), 4.86 (m, 1H), 1.39 (d, J=6.9 Hz, 3H).

Provenance & Evidence