Catalytic Formal [4 + 2] Cycloadditions between Unactivated Allenes and <i>N</i>-Hydroxyaniline Catalyzed by AuCl<sub>3</sub>/CuCl<sub>2</sub>/O<sub>2</sub>
作者:Jian-Ming Chen、Chin-Jung Chang、Yao-Jin Ke、Rai-Shung Liu
DOI:10.1021/jo500009x
日期:2014.5.16
AuCl3-catalyzed formal [4 + 2]-cycloadditions between substituted allenes and N-hydroxyanilines are described. This reaction sequence comprises initial isomerizations of allenes to butadienes under N2 and subsequent oxidations of N-hydroxyanilines to nitrosoarenes under O2. CuCl2 (5 mol %) was added in the second step to increase the oxidation efficiency. The reactions are compatible with various 1,1-di- and
描述了AuCl 3催化的取代的烯与N-羟基苯胺之间的形式[4 + 2]环加成。该反应顺序包括在N 2下将丙二烯初始异构化为丁二烯,然后在O 2下将N-羟基苯胺氧化为亚硝基芳烃。在第二步骤中添加CuCl 2(5mol%)以提高氧化效率。该反应与各种1,1-二-和1,1,3-三取代的烯丙基和N-羟基苯胺衍生物相容。我们的实验数据表明,AuCl 3的作用是3倍,包括N的催化氧化。-羟基苯胺衍生物转化为亚硝基芳烃,烷基取代的亚芳基异构化为二烯,以及最终的亚硝基/丁二烯[4 + 2]环加成。