反应详情

A degassed mixture of N-(2-bromo-6-nitrophenyl)acetamide (XCI) (2.59 g, 10 mmol, 1.0 eq), 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (XCII) (2.05 g, 10 mmol, 1.3 eq), Na2CO3 (2.12 g, 20 mmol, 2 eq) and Pd(PPh3)4 (1.16 g, 1 mmol, 0.1 eq) in a mixed solvent of DME (30 mL) and H2O (10 mL) was heated to reflux under nitrogen overnight, the mixture was poured onto water (40 ml) and extracted with ethyl acetate (30 mL×3). The combined organic layers were dried over Na2SO4, filtered and concentrated in vacuo, purification the resultant residue was purified by column chromatography (EtOAc:PE=1:4→100% EtOAc) to afford N-(2-nitro-6-(pyridin-4-yl)phenyl)acetamide (XCIII) (1.42 g, 5.52 mmol, 55% yield) as a yellow solid. 1H NMR (DMSO-d6, 400 MHz) δ ppm 1.92 (s, 3H), 7.46 (d, J=5.6 Hz, 2H), 7.69 (t, J=8 Hz, 1H), 7.80 (dd, J=7.6 Hz, J=1.2 Hz, 1H), 8.06 (dd, J=8 Hz, J=1.6 Hz, 1H), 8.73 (d, J=6 Hz, 2H), 9.96 (s, 1H); ESIMS found for C13H11N3O3 m/z 258 (M+H).

1. temperaturewas heated
2. temperatureto reflux under nitrogen overnight
3. additionthe mixture was poured onto water (40 ml)
4. extractionextracted with ethyl acetate (30 mL×3)
5. dry with materialThe combined organic layers were dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo, purification the resultant residue
8. customwas purified by column chromatography (EtOAc:PE=1:4→100% EtOAc)