2-(Dimethylamino)ethanol → 1-[3-(4-Chloro-2-methyl-2H-pyrazol-3-yl)4-(2-dimethylamino-ethoxy)-phenyl]-3-(2,4-difluoro-phenyl)-urea

Participants

Reaction Steps

To a solution of 1-[3-(4-chloro-2-methyl-2H-pyrazol-3yl)-4-hydroxy-phenyl]-3-(2,4-difluoro-phenyl)urea (see above) (0.035 g, 0.09 mmol) in THF (3 mL), triphenyl phosphine (0.071 g, 0.27 mmol) and 2-dimethylamino ethanol (27.1 μL, 0.27 mmol) were added followed by dropwise addition of diisopropyl azodicarboxylate (DIAD) (52.3 μL, 0.27 mmol). The reaction mixture was stirred at room temperature for 2 hours, concentrated to give a crude product that was purified via preparative HPLC. The corresponding fractions were collected, neutralized with 1N NaOH and extracted with EtOAc. A second purification by flash chromatography (SiO2, CH2Cl2/MeOH gradient elution) afforded Compound 132 as an off-white solid in 45.9% yield. LCMS m/z (%)=450 (M+H 35Cl, 100), 452 (M+H 37Cl, 32). 1H NMR (400 MHz. DMSO-d6) δ: 9.11 (s, 1H), 8.56 (s, 1H), 8.06-8.00 (m, 1H), 7.60 (s, 1H), 7.52 (d, J=8.95 Hz, 1H), 7.38 (s, 1H), 7.33-7.27 (m, 1H), 7.17 (d, J=9.04 Hz, 1H), 7.05-6.98 (m, 1H), 4.12-3.95 (m, 2H), 3.65 (s, 3H), 2.55-2.51 (m, 2H), 2.10 (s, 6H).

Provenance & Evidence