(3+3)‐Annulation of Carbonyl Ylides with Donor–Acceptor Cyclopropanes: Synergistic Dirhodium(II) and Lewis Acid Catalysis
作者:Martin Petzold、Peter G. Jones、Daniel B. Werz
DOI:10.1002/anie.201814409
日期:2019.5.6
The first (3+3)‐annulation process of donor–acceptorcyclopropanes using synergistic catalysis is reported. The Rh2(OAc)4‐catalyzed decomposition of diazo carbonyl compounds generated carbonyl ylides in situ. These 1,3‐dipoles were converted with donor–acceptorcyclopropanes, activated by Lewisacid catalysis, to afford multiply substituted pyran scaffolds in high yield and diastereoselectivity. Extensive