反应详情

To a stirred solution of 1-(4-vinyl-phenyl)-1H-[1,2,4]triazole (1 g, 5.8 mmol) in 25 mL of THF, was added n-BuLi (0.37 g, 5.8 mmol) at −78° C. and stirred for 30 min. To this N-methoxy N-methylcyclopropoxide in THF (0.82 g, 6.4 mmol) was added and the resultant reaction mixture was stirred at RT for 16 h. The reaction mixture was quenched with a saturated aqueous NH4Cl solution and extracted with EtOAc (3×25 mL). The combined EtOAc layer was washed with brine and dried over sodium sulphate and concentrated under reduced pressure. The crude compound was purified by flash chromatography (SiO2, 100-200 mesh, 40% EtOAc in Pet ether) to afford the title compound as an off white solid (420 mg, 30%): mp 90-91° C.; 1H NMR (400 MHz, CDCl3) δ 8.12 (s, 1H), 7.50 (d, J=7.8 Hz, 2H), 7.38 (d, J=7.8 Hz, 2H), 6.75 (dd, J=16.3, 10.7 Hz, 1H), 5.81 (d, J=16.3 Hz, 1H), 5.35 (d, J=10.7 Hz, 1H), 3.22 (m, 1H), 1.27 (m, 2H), 1.18 (m, 2H); ESIMS m/z 240.18 ([M+H]+); IR (thin film) 2922, 1630 cm−1.

1. customthe resultant reaction mixture
2. stirringwas stirred at RT for 16 h
3. customThe reaction mixture was quenched with a saturated aqueous NH4Cl solution
4. extractionextracted with EtOAc (3×25 mL)
5. washThe combined EtOAc layer was washed with brine
6. dry with materialdried over sodium sulphate
7. concentrationconcentrated under reduced pressure
8. customThe crude compound was purified by flash chromatography (SiO2, 100-200 mesh, 40% EtOAc in Pet ether)