反应详情

温度

90 °C

A mixture of 3-cyano-4-trifluoromethyl-1-fluorobenzene (70, g, 0.37, mol, Oakwood), 4-hydroxyphenylboronic acid (50, g, 0.36, mol, Boron Molecular), K2CO3, (70, g) and DMF/water (400, mL/40, mL) was heated to 100° C. for 3, h. After cooling to RT, the mixture was diluted with water (1, L) and extracted with EtOAc (1.5, L). The organic layer was washed with water (0.5, L) and brine, concentrated and purified by chromatographed over silica gel with 4% MeOH in chloroform to give (4-(3-cyano-4-(trifluoromethyl)phenoxy)phenyl)boronic acid as pink solid (50, g, 45%). 1H NMR (400, MHz, CD3OD) 7.70-7.70, (3H, m), 7.35, (1H, d, J=2.4, Hz), 7.24, (1H, dd, J=2.2, & 8.8, Hz), 7.00, (2H, d, J=7.7, Hz). [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II) (17, mg, 0.022 mmol, Aldrich) was added to a mixture of 2-(6-bromopyridin-2-yl)-2-hydroxyacetamide (50, mg, 0.22, mmol), (4-(3-cyano-4-(trifluoromethyl)phenoxy)phenyl)boronic acid (100, mg, 0.32, mmol) and cesium carbonate (140, mg, 0.43 mmol) in EtOH/DME/water (2, mL/2, mL/1, mL) at room temperature. The reaction mixture was flushed with argon, then, shaken at 90° C. for 3, h. After cooling to RT, the reaction was quenched with water (2, mL), and extracted with EtOAc (10 mL). The organic layer was separated, concentrated and purified by reverse-phase prep HPLC (C18, 0-100% 0.1% TFA in water/0.1% TFA in ACN) to give 2-(6-(4-(3-cyano-4-(trifluoromethyl)phenoxy)phenyl)pyridin-2-yl)-2-hydroxyacetamide (Cpd. No. 6) as off-white solid (45, mg, 50%). LC/MS: m/z=414.1, [M+H]+, ; 1H NMR (400, MHz, DMSO-d6) 8.15, (2H, d, J=8.4, Hz), 7.93 (1H, d, J=9.2, Hz), 7.82-7.86, (3H, m), 7.37-7.45, (3H, m), 7.26, (2H, d, J=9.2, Hz), 4.95, (1H, s).

1. customat room temperature
2. customThe reaction mixture was flushed with argon
3. temperatureAfter cooling to RT
4. customthe reaction was quenched with water (2, mL)
5. extractionextracted with EtOAc (10 mL)
6. customThe organic layer was separated
7. concentrationconcentrated
8. custompurified by reverse-phase prep HPLC (C18, 0-100% 0.1% TFA in water/0.1% TFA in ACN)