反应详情

To a solution of 2-benzyloxy-4-chloro-3-nitro-pyridine (Wilde, et. al. WO 99/01454, which is incorporated herein by reference)(5 g, 18.9 mmol) in DME/H2O, was added 2,4-dichlorophenylboronic acid (3.60 g, 18.9 mmol), Ba(OH)2 0.8H2O (5.96 g, 18.9 mmol), and Pd(PPh3)2Cl2 (0.77 g, 1.09 mmol) and the mixture was heated at reflux for 5 h. The reaction was cooled and poured into EtOAc and H2O (500 mL). The EtOAc layer was washed with H2O, brine, dried (Na2SO4), filtered and concentrated in vacuo. Purification using flash chromatography (10% EtOAc-Hexane) gave 5.79 g (82%) of 2-benzyloxy-4-(2,4-dichloro-phenyl)-3-nitro-pyridine as a viscous oil: crude MS (AP) m/z 375.2 [(M+H)+, 100].

1. temperaturethe mixture was heated
2. temperatureat reflux for 5 h
3. temperatureThe reaction was cooled
4. washThe EtOAc layer was washed with H2O, brine
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customPurification