Synthesis and thiolation of 1,3-difluoro-2,4,6-trihaloanilines and benzenes
作者:Jason T Manka、Piotr Kaszynski
DOI:10.1016/s0022-1139(03)00172-6
日期:2003.11
Three pentahaloanilines were prepared by stepwisehalogenation of 3,5-difluoroaniline and were deaminated to form pentahalobenzenes. Alternatively, two pentahalobenzenes were obtained by lithiation followed by iodination of 1,3-difluoro-4,6-dihalobenzenes. Alkylthiolation reactions of pentahaloanilines and benzenes in Me2SO were investigated.
Synthesis of polyfluorinated 4-phenyl-3,4-dihydroquinolin-2-ones and quinolin-2-ones via superacidic activation of N-(polyfluorophenyl)cinnamamides
作者:Larisa Yu. Safina、Galina A. Selivanova、Konstantin Yu. Koltunov、Vitalij D. Shteingarts
DOI:10.1016/j.tetlet.2009.07.013
日期:2009.9
The cyclization reactions of a series of polyfluorocinnamanilides in triflic acid (CF3SO3H) yield 4-phenyl-3,4-dihydi-oquinolin-2-ones, which include a polyfluorinated benzene moiety as a part of the quinoline scaffold. These compounds undergo dehydrophenylation in the presence of AlCl3 to give the Corresponding polyfluoroquinolin-2-ones which are converted into polyfluorinated 2-chloroquinolines on treatment with POCl3. A mechanism for the cyclization reaction presuming the intermediacy of a superelectrophilic O,C-diprotonated form of the starting material is suggested. (C) 2009 Elsevier Ltd. All rights reserved.