New Synthesis of 2-Heteroarylperfluoropropionic Acids Derivatives by Reaction of AzineN-Oxides with Hexafluoropropene
作者:Rafał Loska、Mieczysław Mąkosza
DOI:10.1002/chem.200701416
日期:2008.3.7
Hexafluoropropene reacts with aromatic azine N-oxides under mild conditions to produce fluorides of 2-heteroarylperfluoropropionic acids. The reaction proceeds as 1,3-dipolar cycloaddition followed by spontaneous scission of the N--O bond in the isoxazolidine ring and elimination of HF. When the reaction is carried out in the presence of alcohols or N-alkyl anilines, the in situ formed acyl fluorides
六氟丙烯在温和的条件下与芳香族N-氧化物反应生成2-杂芳基全氟丙酸的氟化物。该反应以1,3-偶极环加成反应的形式进行,然后自发切断异恶唑烷环中的N-O键并消除HF。当反应在醇或N-烷基苯胺的存在下进行时,原位形成的酰基氟给出相应的酯和酰胺。它们也可以分别用亲核试剂处理以产生各自的酰化产物,而它们的水解导致不稳定的羧酸经历自发脱羧成1-芳基-1,2,2,2-四氟乙烷。该新反应提供了合成以前未知且不可用的2-杂芳基全氟丙酸衍生物的简单且通用的方法。