Catalytic Asymmetric Intramolecular [4+2] Cycloaddition of In Situ Generated <i>ortho</i>
-Quinone Methides
作者:Youwei Xie、Benjamin List
DOI:10.1002/anie.201612149
日期:2017.4.24
Herein, we describe the first catalytic asymmetricintramolecular [4+2] cycloaddition of in situ generated ortho‐quinone methides. In the presence of a confined chiral imidodiphosphoric acid catalyst, various salicylaldehydes react with dienyl alcohols to give transient ortho‐quinone methide intermediates, which undergo an intramolecular [4+2] cycloaddition to provide highly functionalized furanochromanes