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 betweensubstituted 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