反应详情

温度

112.5 °C

To a solution of 1-(2,3-Difluorophenyl)-2-(1-(trityloxy)but-3-en-2-yloxy)ethanone oxime (20.0 g, 0.0400 mol, 1.0 equiv.) in toluene (140 mL) was charged hydroquinone (0.0882 g, 0.008 mol, 0.2 equiv.). The reaction mixture was heated to reflux (110-115° C.) and held for 13 h. The reaction mixture was cooled to 20-25° C. and then concentrated under vacuum (T<45° C.). The solvents were chased with 2-propanol (100 mL). To the crude residue was charged isopropanol (140 mL) and the mixture was heated to 65-70° C. until a clear solution is formed. The solution was cooled to 0° C. at 10° C./hr and then held for 1 h. The resulting suspension was filtered and the solid was rinsed with cold 2-propanol (40.0). After drying the title compound was obtained as a powder (13.2 g). 1H NMR (500 MHz, DMSO) δ ppm 7.42-7.33 (m, 8H), 7.31 (t, J=7.6 Hz, 6H), 7.28-7.21 (m, 3H), 7.20-7.12 (m, 1H), 6.39 (s, 1H), 4.13 (d, J=8.2 Hz, 1H), 4.03 (s, 1H), 3.97 (s, 1H), 3.89 (d, J=9.2 Hz, 1H), 3.81-3.70 (m, 1H), 3.36-3.29 (m, 1H), 3.26 (dd, J=10.1, 6.0 Hz, 1H), 3.15 (dd, J=10.0, 3.5 Hz, 1H); 13C NMR (125 MHz, DMSO) δ ppm 150.74 (dd, JCF=246.4, 14.4 Hz), 148.66 (dd, JCF=248.3, 13.5 Hz), 144.09, 130.58, 128.67, 128.32, 127.48, 124.75, 124.45, 117.18 (d, JCF=17.0 Hz), 86.57, 84.91, 78.16, 76.81, 64.82, 56.46.

1. temperatureThe reaction mixture was heated
2. temperatureThe reaction mixture was cooled to 20-25° C.
3. concentrationconcentrated under vacuum (T<45° C.)
4. additionTo the crude residue was charged isopropanol (140 mL)
5. temperaturethe mixture was heated to 65-70° C. until a clear solution
6. customis formed
7. temperatureThe solution was cooled to 0° C. at 10° C./hr
8. waitheld for 1 h
9. filtrationThe resulting suspension was filtered
10. washthe solid was rinsed with cold 2-propanol (40.0)
11. dry with materialAfter drying the title compound