Nucleophilic trifluoromethylation of RF-containing 4-quinolones, 8-aza- and 1-thiochromones with (trifluoromethyl)trimethylsilane
摘要:
Reactions of N-substituted 2-polyfluoroalkyl-4-quinolones and 8-aza-5,7-dimethyl-2-polyfluoroalkylchromones with (trifluoromethyl)-trimethylsilane proceed mainly as a 1,4-nucleophilic trifluoromethylation to give N-substituted 2,2-bis(polyfluoroalkyl)-2,3-dihydroquinolin-4(1H)-ones and 5,7-dimethyl-2,2-bis(polyfluoroalkyl)-2,3-dihydro-4H-pyrano[2,3-b]pyridin-4-ones after acid hydrolysis. Similar reaction with 2-trifluoromethyl-4H-thiochromen-4-one proceeds as a 1,2-addition to give 2,4-bis(trifluoromethyl)-4H-thiochromen-4-yl trimethylsilyl ether. (c) 2005 Elsevier B.V. All rights reserved.
A simple and highly efficient synthesis of N-phenyl-2-polyfluoroalkyl-4-quinolones from 2-anilinoacetophenone and RFCO2Et
摘要:
The condensation of 2-anilinoacetophenone with RFCO2Et (R-F = CF2H, CF3, C2F5) in the presence of LiH in THF affords the corresponding N-phenyl-2-polyfluoroalkyl-4-quinolones in excellent yields. (C) 2004 Elsevier B.V. All rights reserved.