Direct Stereocontrolled Synthesis of Polyoxygenated Hydrobenzofurans and Hydrobenzopyrans from <i>p</i>-Peroxy Quinols
作者:Silvia Barradas、M. Carmen Carreño、Marcos González-López、Alfonso Latorre、Antonio Urbano
DOI:10.1021/ol702236e
日期:2007.11.1
tandem catalytic process on p-peroxy quinols with hydroxy alkyl chains at C-4 allowed the one-pot synthesis of hydrobenzofuran and hydrobenzopyran tricyclic epoxides. In this transformation, two new cycles and four new stereogenic centers are created in a highly stereocontrolled manner. The usefulness of the strategy is illustrated with the first total synthesis and structural revision of natural product
Oxidative De-aromatization ofpara-Alkyl Phenols intopara-Peroxyquinols andpara-Quinols Mediated by Oxone as a Source of Singlet Oxygen
作者:M. Carmen Carreño、Marcos González-López、Antonio Urbano
DOI:10.1002/anie.200504605
日期:2006.4.21
Spirofused and Annulated 1,2,4‐Trioxepane‐, 1,2,4‐Trioxocane‐, and 1,2,4‐Trioxonane‐Cyclohexadienones: Cyclic Peroxides with Unusual Ring Conformation Dynamics
hydroperoxides. This reaction can also be performed with photochemically generated singletoxygen. However, other characteristic singletoxygenreactions do not proceed with caroate. The initially formed hydroperoxides cyclize in the presence of a Lewis acid catalyst based on boron, indium, or iron to give spiroannulated peroxides. These exhibit restricted ring inversion whereas larger nine‐membered‐ring peroxides