Organocatalytic Asymmetric Synthesis of Dihydrobenzoxazinones Bearing Trifluoromethylated Quaternary Stereocenters
作者:Hengqiao Lou、Yongtao Wang、Enze Jin、Xufeng Lin
DOI:10.1021/acs.joc.5b02848
日期:2016.3.4
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。