Phosphine‐Catalyzed (3+2) Annulation of Isoindigos with Allenes: Enantioselective Formation of Two Vicinal Quaternary Stereogenic Centers
作者:Wai‐Lun Chan、Xiaodong Tang、Fuhao Zhang、Glenn Quek、Guang‐Jian Mei、Yixin Lu
DOI:10.1002/anie.201900758
日期:2019.5.6
Construction of contiguous all‐carbon quaternary stereogenic centers is a long‐standing challenge in synthetic organic chemistry. In this report, a phosphine‐catalyzed enantioselective (3+2) annulation reaction between allenes and isoindigos, containing either two identical or different oxindole moieties, is introduced as a powerful strategy for the construction of spirocyclic bisindoline alkaloid
连续的全碳四元立体异构中心的建设是合成有机化学中的长期挑战。在本报告中,引入了膦催化的异戊二烯和异靛蓝之间的对映选择性(3 + 2)环化反应,其中包含两个相同或不同的羟吲哚基团,是构建螺环双吲哚啉生物碱核心结构的有力策略。报告的反应具有很高的化学收率,优异的对映选择性和非常好的区域选择性,对产生结构上具有挑战性的双吲哚啉天然产物非常有用。