(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–acceptor cyclopropanes 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–acceptor cyclopropanes, activated by Lewis acid catalysis, to afford multiply substituted pyran scaffolds in high yield and diastereoselectivity. Extensive
报道了使用协同催化的供体-受体环丙烷的第一个(3 + 3)环化过程。重氮羰基化合物的Rh 2(OAc)4催化分解原位生成羰基。这些1,3-偶极通过供体-受体环丙烷转化,并通过路易斯酸催化活化,从而以高收率和非对映选择性提供多取代的吡喃骨架。广泛的优化研究使人们能够利用溶剂对中间反应性的影响,获得9-氧杂双环[3.3.1]壬南-2-酮和10-氧杂双环[4.3.1]癸烯-2-醇核。