AbstractSynthesis of 2-fluoroalkylated oxazoles was developed by transition-metal-free intramolecular cyclization of N-propargylic amides, which are prepared from propargylic amines by employing a small excess of commercially available fluorocarboxylic acid anhydrides as fluoroalkyl sources, under basic conditions. Oxazoles bearing a trifluoromethyl, pentafluoroethyl, or heptafluoropropyl group at the C2 position and functional groups on the C4 and/or C5 positions are obtained in moderate to high yields by controlling the reaction conditions.
摘要 在碱性条件下,通过使用少量过量的市售氟羧酸酐作为氟烷基源,从丙炔胺制备 N-丙炔酰胺,通过无过渡金属分子内环化合成 2-氟烷基噁唑。通过控制反应条件,可以获得 C2 位上带有三氟甲基、五氟乙基或七氟丙基以及 C4 和/或 C5 位上带有官能团的噁唑,产率从中等到较高不等。