enantioselective aza-Friedel–Crafts reaction of trifluoromethyl benzoxazinones with pyrroles is reported. Under mild conditions, a range of enantioenriched dihydrobenzoxazinones bearing trifluoromethylated quaternary stereocenters could be obtained in good to excellent yield and ee. A remarkable fluorine effect is observed, and preliminary mechanistic studies combined with theory calculations suggest that tr
据报道,手性
磷酸催化三
氟甲基苯并恶嗪酮与
吡咯的对映选择性氮杂-弗里德尔-克拉夫茨反应。在温和的条件下,可以获得一系列具有三
氟甲基化的季立构中心的对映体富集的二氢苯并恶嗪酮,收率和收率良好。观察到显着的
氟效应,并且初步的机理研究与理论计算相结合表明,三氢键相互作用牢固地保持了过渡结构,并允许催化剂的庞大取代基影响对映选择性。