Trifluoroacetic acid → HCID 118272533, compound

Participants

Reaction Steps

A solution of (R)-1-(3-amino-1-trityl-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea (310 mg, 0.576 mmol) and triethylsilane (184 μl, 1.151 mmol) in DCM (5232 μl) were treated with trifluoroacetic acid (2660 μl, 34.5 mmol) and stirred for 1 hr at room temperature. Reaction mixture was evaporated in vacuo, partioned between EtOAc/saturated aqeous NaHCO3 and extracted with EtOAc (2×). Combined organics were washed with saturated aqeous NaHCO3, brine, dried over Na2SO4 and evaporated in vacuo affording crude product which was purified by normal phase column chromotography eluting with MeOH/EtOAc (0-10%) affording (R)-1-(3-amino-1H-pyrazolo[4,3-c]pyridin-6-yl)-3-(1-phenylethyl)urea (145 mg, 0.489 mmol, 85% yield) as an off white solid. 1H NMR (500 MHz, dmso) δ 11.42 (s, 1H), 8.87 (s, 1H), 8.57 (s, 1H), 8.07 (s, 1H), 7.39-7.27 (m, 4H), 7.27-7.17 (m, 1H), 5.64 (s, 2H), 4.86 (m, 1H), 1.39 (d, 3H). MS ESI calc'd. For C15H16N6O[M+H]+ 297. found 297.

Provenance & Evidence