A Divergent Approach to Indoles and Oxazoles from Enamides by Directing-Group-Controlled Cu-Catalyzed Intramolecular C–H Amination and Alkoxylation
作者:Chiaki Yamamoto、Kazutaka Takamatsu、Koji Hirano、Masahiro Miura
DOI:10.1021/acs.joc.7b01667
日期:2017.9.1
divergent approach to indoles and oxazoles from enamides has been developed. The picolinamide-derived enamides undergo the intramolecular aromatic C–H amination in the presence of a Cu(OPiv)2 catalyst and an MnO2 oxidant to form the corresponding indoles in good yields. On the other hand, simpler aryl- or alkyl-substituted enamides are converted to the 2,4,5-trisubstituted oxazole frameworks via vinylic C–H
已开发了一种直接基团控制,铜催化的发散方法,用于从酰胺类化合物中分离吲哚和恶唑。吡啶甲酰胺衍生的酰胺在Cu(OPiv)2催化剂和MnO 2氧化剂存在下经历分子内芳族CH胺化反应,以高收率形成相应的吲哚。另一方面,在相同条件下,较简单的芳基或烷基取代的酰胺类化合物会通过乙烯基C–H烷氧基化反应转化为2,4,5-三取代的恶唑骨架。铜催化作用可以使药物和材料化学中极为重要的吲哚和恶唑杂芳族核具有独特的发散性。