反应详情

温度

120 °C

In a 350-mL resealable vessel, Pd2dba3 (1.487 g, 1.623 mmol), dicyclohexyl(2′,6′-dimethoxy-[1,1′-biphenyl]-2-yl)phosphine (1.444 g, 3.52 mmol), dicyanozinc (3.18 g, 27.1 mmol), and methyl 5-chloro-3-methoxypicolinate (step 1, 5.455 g, 27.1 mmol) were taken up in DMF (80 mL). The reaction mixture was purged with Argon and subsequently heated to 120° C. for 2 h. Upon cooling, the reaction mixture was concentrated under reduced pressure. The residue was filtered through Celite, and the filter cake was rinsed with 1% MeOH/DCM. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel chromatography (33%-40% EtOAc/hexane) to afford the title compound as a white solid (4.51 g, 23.5 mmol, 87%). MS m/z=193 [M+H]+. Calculated for C9H8N2O3: 192. 1H NMR in CDCl3 δ: 8.51 (d, 1H, J=1.6), 7.55 (d, 1H, J=1.6), 4.00 (s, 3H), 3.97 (s, 3H).

1. customThe reaction mixture was purged with Argon
2. temperatureUpon cooling
3. concentrationthe reaction mixture was concentrated under reduced pressure
4. filtrationThe residue was filtered through Celite
5. washthe filter cake was rinsed with 1% MeOH/DCM
6. concentrationThe filtrate was concentrated under reduced pressure
7. customthe residue was purified by silica gel chromatography (33%-40% EtOAc/hexane)