反应详情

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 3-dimethylamino propanol (31.6 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 four times. A second purification by flash chromatography (SiO2, CH2Cl2/MeOH gradient elution) afforded Compound 133 as an off-white solid in 25.4% yield. LCMS m/z (%)=464 (M+H 35Cl, 100), 466 (M+H 37Cl, 39). 1H NMR (400 MHz, DMSO-d6) δ: 9.02 (s, 1H), 8.47 (s, 1H), 8.07-8.01 (m, 1H), 7.62 (s, 1H), 7.51 (d, J=8.90 Hz, 1H), 7.38 (s, 1H), 7.33-7.28 (m, 1H), 7.15 (d, J=9.02 Hz, 1H), 7.03-6.97 (m, 1H), 4.11-3.94 (m, 2H), 3.63 (s, 3H), 2.28-2.18 (m, 2H), 2.11 (s, 6H), 1.78-1.69 (m, 2H).

1. concentrationconcentrated
2. customto give a crude product that
3. customwas purified via preparative HPLC
4. customThe corresponding fractions were collected
5. extractionextracted with EtOAc four times
6. customA second purification
7. washby flash chromatography (SiO2, CH2Cl2/MeOH gradient elution)