反应详情

温度

-36 °C

Titanium isopropoxide (1.1 mL, 3.77 mmol) was added to a mixture of 4-(5-formyl-pyridin-3-yl)-3-methoxy-benzonitrile (449 mg, 1.88 mmol) and ethanesulfonamide (226 mg, 2.07 mmol) in toluene (10 mL) at room temperature. The resulting mixture was heated to reflux for 2 h. After concentration, the residue was dissolved in THF (7 mL) and a solution of c-PrMgBr (0.5 M in THF, 18.8 mL, 9.42 mmol) was added dropwise at −40° C. The resulting mixture was stirred at −36° C. for 1 h. Saturated NH4Cl solution was added to the reaction mixture. The resulting mixture was diluted with ethyl acetate and brine and subsequently filtered. The organic layer was separated and concentrated. The residue was purified by flash column (EtOAc/Heptane=0-60%) to give the title compound (182 mg, 26% yield); ESI-MS m/z: 372 [M+1]; 1H-NMR (MeOD, 400 MHz) δ 8.59 (1H, d, J=2.0 Hz), 8.57 (1H, d, J=2.0 Hz), 8.07 (1H, t, J=2.0 Hz), 7.54 (1H, d, J=7.6 Hz), 7.49 (1H, s), 7.45 (1H, d, J=7.6 Hz), 7.42 (1H, d, J=8.4 Hz), 3.89 (3H, s), 3.88 (1H, d, J=9.2 Hz), 3.01-2.88 (2H, m), 1.30-1.25 (1H, m), 1.25 (1H, t, J=7.2 Hz), 0.77-0.70 (1H, m), 0.64-0.54 (2H, m), 0.48-0.42 (1H, m)

1. temperatureThe resulting mixture was heated
2. temperatureto reflux for 2 h
3. concentrationAfter concentration
4. dissolutionthe residue was dissolved in THF (7 mL)
5. filtrationsubsequently filtered
6. customThe organic layer was separated
7. concentrationconcentrated
8. customThe residue was purified by flash column (EtOAc/Heptane=0-60%)