Chirality Transfer from the Oxidative Dearomatization of Axially Chiral Binols with Oxone under Mild Conditions
作者:Antonio Urbano、Sara Vallejo、María J. Cabrera-Afonso、Elena Yonte
DOI:10.1021/acs.orglett.0c02194
日期:2020.8.7
Easily accessible axially chiral substituted binols (95 to >99% ee) undergo an oxidative dearomatization process with the system Oxone/NaHCO3/acetone, under mild conditions, to afford pentacyclic hemiacetalic cis-diols (94 to >99% ee), bearing two new stereogenic centers, through an efficient axial-to-central chirality transfer.
Dimerization of 2-hydroxyanthracene was investigated with 5 mol % of various catalysts that are efficient catalysts for the dimerization of 2-naphthol. Catalysts such as Cu(OH)Cl·TMEDA, [Mn(acac)3], and [Mn(acac)2] did not give satisfactory results. However, MnI2, which gave only trace amounts of dimerization product of 2-naphthol under the same conditions, afforded 2,2′-dihydroxy-1,1′-bianthracene in 74% yield.