Chiral Naphthyl-C2-Indole as Scaffold for Phosphine Organocatalysis: Application in Asymmetric Formal [4 + 2] Cycloaddition Reactions
作者:Tingting He、Lei Peng、Shan Li、Fangli Hu、Chuandong Xie、Shengli Huang、Shiqi Jia、Wenling Qin、Hailong Yan
DOI:10.1021/acs.orglett.0c02519
日期:2020.9.4
naphthyl-C2-indole bifunctional phosphine organocatalyst in stereoselective formal [4 + 2] cycloaddition reactions were reported. The chiral naphthyl-C2-indole skeleton was introduced to bifunctional phosphine organocatalysis for the first time, and excellent stereocontrol was achieved in two types of formal [4 + 2] cycloaddition reactions. With the optimal catalyst, a series of chiral spirooxindole and hydrodibenzofuran
报道了一种新设计的手性萘-C2-吲哚双功能膦有机催化剂在立体选择性形式[4 + 2]环加成反应中的应用。首次将手性萘基C2-吲哚骨架引入双功能膦有机催化中,并在两种类型的正式[4 + 2]环加成反应中实现了出色的立体控制。使用最佳的催化剂,可以以中等至良好的收率和优异的立体选择性(高达> 99%ee,> 20:1 dr)生产一系列手性螺并吲哚和氢二苯并呋喃结构。