An Improved Access to 4-Trifluoromethyl-2(1H)-quinolinones: The“Watering Protocol”
作者:Marc Marull、Olivier Lefebvre、Manfred Schlosser
DOI:10.1002/ejoc.200300531
日期:2004.1
4-(trifluoromethyl)-2-quinolinones, can be favored and the competing condensation to produce the Et 4,4,4-trifluoro-3-(phenylimino)butanoate, the precursor to 2-(trifluoromethyl)-4-quinolinones, avoided if water is occasionally added to the reaction mixt. while ethanol is continuously removed by distn. The 4,4,4-trifluoro-3-oxobutaneanilides also form selectively when 4,4,4-trifluoroacetoacetyl chloride is
苯胺与 Et 4,4,4-三氟乙酰乙酸酯缩合得到相应的 4,4,4-trifluoro-3-oxobutaneanilides,4-(trifluoromethyl)-2-quinolinones 的前体,可以有利地和竞争缩合产生Et 4,4,4-trifluoro-3-(phenylimino)butanoate 是 2-(trifluoromethyl)-4-quinolinones 的前体,如果偶尔向反应混合物中加入水,则应避免使用。而乙醇是通过分离不断去除的。当 4,4,4-三氟乙酰乙酰氯与苯胺反应时,4,4,4-三氟-3-氧代丁烷苯胺也会选择性地形成。必须在仔细控制的条件下完成苯胺的环化。所得的 4-(三氟甲基)-2-喹啉酮可转化为 4-(三氟甲基)喹啉、4-(三氟甲基)-2-喹啉羧酸、和 2-溴-4-(三氟甲基)喹啉,最后一种可依次转化为 2-溴-4-(三氟甲基)-3-喹啉羧酸,并最终转化为