作者:B. I. Usachev、M. A. Shafeev、V. Ya. Sosnovskikh
DOI:10.1007/s11172-005-0115-9
日期:2004.10
2-Polyfluoroalkylchromene-4(4H)-thiones, synthesized from 2-polyfluoroalkylchromones and P2S5, react with aniline, phenylhydrazines, and hydroxylamine at the C(4) atom and afford corresponding anils, phenylhydrazones, and oximes of chromones. On heating in alcohol in the presence of concentrated HCl, chromone phenylhydrazones and oximes undergo ring closure to form 3-(2-hydroxyaryl)-1-phenyl-5-polyfluoroalkylpyrazoles and 5-hydroxy-3-(2-hydroxyaryl)-5-polyfluoroalkyl-Δ2-isoxazolines.
由 2-多氟烷基铬和 P2S5 合成的 2-多氟烷基铬-4(4H)-亚硫酰,与苯胺、苯肼和羟胺在 C(4)原子上发生反应,生成相应的苯胺、苯肼和铬酮的肟。在有浓盐酸存在的酒精中加热时,铬酮苯肼和肟会发生闭环反应,生成 3-(2-羟基芳基)-1-苯基-5-聚氟烷基吡唑和 5-羟基-3-(2-羟基芳基)-5-聚氟烷基-Δ2-异恶唑。