Site‐selective Oxidative Dearomatization of Phenols and Naphthols into
<i>ortho</i>
‐Quinols or Epoxy
<i>ortho</i>
‐Quinols using Oxone as the Source of Dimethyldioxirane
作者:María J. Cabrera‐Afonso、M. Carmen Carreño、Antonio Urbano
DOI:10.1002/adsc.201900660
日期:2019.10.8
A novel reactivity of dimethyldioxirane, generated in situ from Oxone and acetone, with substituted phenols and naphthols is reported. This methodology allowed the synthesis of ortho‐quinols or epoxy ortho‐quinols from a site‐selective oxidative dearomatization process, with good yields under very mild conditions. A short total synthesis of natural product lacinilene C methyl ether is also described
′I′ is all the hype: A twofold excess of iodoarene in the title reaction leads to ortho‐quinols in good yields, whereas organocatalytic versions of this reaction enable subsequent epoxidation in a regio‐ and diastereoselective fashion. Chiral iodobiarenes led to enantioselectivities up to 50 % ee. m‐CPBA=meta‐chloroperoxybenzoic acid.