反应详情

温度

90 °C

A reaction vessel was charged with 5-bromo-3-iodopyridin-2-amine (1 g, 3.35 mmol), tert-butyl acrylate (0.97 mL, 6.69 mmol), and (i-Pr)2EtN (1.75 mL, 10.01 mmol) followed by propionitrile (20 mL) and then DMF (5 mL). The solution was de-oxygenated with argon for 15 minutes. The mixture was treated with Pd(OAc)2 (75 mg, 0.34 mmol) and P(o-tol)3 (204 mg, 0.67 mmol) then heated to 90° C. for 16 h (overnight) then filtered through a pad of silica gel. The filtrate was concentrated and dried under reduced pressure to give a dark brown residue which was subjected to flash chromatography on silica gel using 20% ethyl acetate:hexanes to 40% ethyl acetate:hexanes. The appropriate fractions were collected and concentrated to give a yellow solid. Yield: 700 mg (70%); 1H NMR (300 MHz, DMSO-d6) δ 8.06 (d, 1H, J=2.3 Hz), 8.03 (d, 1H, J=2.3 Hz), 7.61 (d, 1H, J=15.0 Hz), 6.58 (s, 2H), 6.50 (d, 1H, J=15.0 Hz), 1.50 (s, 9H); ESI MS m/z 299 (100%); 301 (100%) [C12H15N2O2Br+H]+

1. filtrationthen filtered through a pad of silica gel
2. concentrationThe filtrate was concentrated
3. customdried under reduced pressure
4. customto give a dark brown residue which
5. customThe appropriate fractions were collected
6. concentrationconcentrated
7. customto give a yellow solid