Design of 1-Phosphanorbornene Derivatives as Chiral Organocatalysts for Enantioselective (4 + 2) Annulation Reactions of γ-Benzyl Allenoates
作者:Siming Jia、Mengmeng Ma、Er-Qing Li、Zheng Duan、Françis Mathey
DOI:10.1021/acs.orglett.1c00833
日期:2021.5.7
and commercially available starting materials in five chemical operations (totally 4.16g scale), are introduced. To our delight, the JiaPhos catalysts display good performance in enantioselective (4 + 2) annulations involving 3-methylene-2-oxindoles and γ-benzyl allenoates, providing a wide range of 3,3′-spirocyclic oxindoles with good efficiency and enantioselectivity.
引入了两种新型的非对映异构的P-手性磷化氢催化剂,即JiaPhos,它们可以通过五种化学操作(总计4.16g规模)轻松地从廉价且可商购的原料中获得。令我们高兴的是,JiaPhos催化剂在涉及3-亚甲基-2-氧吲哚和γ-苄基脲基酸酯的对映选择性(4 + 2)环合中显示出良好的性能,可提供多种具有良好效率和对映选择性的3,3'-螺环式吲哚。