反应详情

The solution of urea 314 (150 mg, 0.245 mmol) and TFA (1 mL, 12.98 mmol) in DCM (20 mL) was stirred 4 hr at room temperature and concentrated. The residue was partitioned between EtOAc/NaHCO3 sat. solution. The solid was collected by filtration and combined with organic layer. The mixture was concentrated and the residue was purified via Biotage (EA/MeOH 0-40%, 12 g Silicycle HR column). Collected fractions gave the desired product 315 (70 mg, 0.137 mmol, 55.8% yield) as a white solid. 1HNMR (dmso-d6) δ(ppm) 1H:8.67 (s, 1H), 8.48 (d, 1H, J=5.5 Hz), 7.91 (s, 1H), 7.65 (dd, 1H, J1=13.7 Hz, J2=2.6 Hz), 7.32 (t, 1H, J=9.0 Hz), 7.07 (m, 2H), 6.63 (d, 1H, J=5.5 Hz), 6.13 (d, 1H, J=7.6 Hz), 4.04 (s, br, 2H), 3.08 (s, 3H), 3.72 (m, 1H), 3.47 (t, 2H, J=5.2 Hz), 3.24 (s, 3H), 2.94 (m, 2H), 1.07 (s, 3H, 1.05 (s, 3H) (presumably a mono-TFA salt). MS: 513.4 (MH)+

1. concentrationconcentrated
2. customThe residue was partitioned between EtOAc/NaHCO3 sat. solution
3. filtrationThe solid was collected by filtration
4. concentrationThe mixture was concentrated
5. customthe residue was purified via Biotage (EA/MeOH 0-40%, 12 g Silicycle HR column)