反应详情

温度

25 °C

A solution trimethylaluminium 2 M in toluene (20.77 mL, 41.5 mmol) was added to a stirred solution of 4-(trifluoromethoxy)aniline (2.247 mL, 16.62 mmol) in toluene (150 mL) under an argon atmosphere. After 30 min, a solution of 6-chloro-5-cyanonicotinic acid ethyl ester (3.5 g, 16.62 mmol) in toluene (10 mL) was added and the RM was stirred at 25° C. for 1 h. After cooling to 5° C., the RM was treated dropwise with a solution of sat. aq. NH4Cl (50 mL) and EtOAc (50 mL) was added. The mixture was stirred for 60 min, filtered over Hyflo® and extracted with EtOAc. The combined extracts were dried over Na2SO4 and the solvent was evaporated off under reduced pressure to give a crude product which was purified by flash chromatography (RediSep® Silica gel column, n-heptane/EtOAc, from 0 to 30% EtOAc) and recrystallized from n-hexane/DCM to afford the title compound as a yellow crystalline solid. m.p. 198-200° C., HPLC (Condition 4) tR=6.24 min, UPLC-MS (Condition 8) tR=1.14 min, m/z=340.1 [M+H]+; 1H-NMR (400 MHz, DMSO-d6) δ ppm 7.15-7.34 (m, 2H), 7.67 (d, J=8.99 Hz, 2H), 8.02 (br. s, 1H), 8.53 (d, J=2.35 Hz, 1H), 9.05 (d, J=2.35 Hz, 1H).

1. temperatureAfter cooling to 5° C.
2. additionwas added
3. stirringThe mixture was stirred for 60 min
4. filtrationfiltered over Hyflo®
5. extractionextracted with EtOAc
6. dry with materialThe combined extracts were dried over Na2SO4
7. customthe solvent was evaporated off under reduced pressure
8. customto give a crude product which
9. customwas purified by flash chromatography (RediSep® Silica gel column, n-heptane/EtOAc, from 0 to 30% EtOAc)
10. customrecrystallized from n-hexane/DCM