Synthesis of 3-alkylamino-3-(2-hydroxyaryl)-1-polyfluoroalkylprop-2-en-1-ones and 2-polyfluoroalkyl-4H-chromen-4-imines
作者:V. Ya. Sosnovskikh、B. I. Usachev
DOI:10.1023/b:rucb.0000030815.40767.a1
日期:2004.2
Condensation of Schiff"s bases (prepared from 2-hydroxy- or 2-hydroxy-5-methylacetophenones and primary amines) with ethyl polyfluoroalkanoates in the presence of LiH in THF affords 3-alkylamino-3-(2-hydroxyaryl)-1-polyfluoroalkylprop-2-en-1-ones, which undergo cyclization in acidic media into 2-polyfluoroalkyl-4H-chromen-4-iminium salts. When neutralized with aqueous ammonia, the latter give 2-po
席夫碱(由 2-羟基-或 2-羟基-5-甲基苯乙酮和伯胺制备)与多氟链烷酸乙酯在 THF 中在 LiH 存在下缩合得到 3-烷基氨基-3-(2-羟基芳基)-1-多氟烷基丙-2-烯-1-酮,在酸性介质中环化成2-多氟烷基-4H-chromen-4-亚胺盐。当用氨水中和时,后者得到2-多氟烷基-4H-chromen-4-亚胺高产。