Catalytic Asymmetric Three‐component Hydroacyloxylation/ 1,4‐Conjugate Addition of Ynamides
作者:Xiangqiang Li、Mingyi Jiang、Tangyu Zhan、Weidi Cao、Xiaoming Feng
DOI:10.1002/asia.202000503
日期:2020.7
derivatives containing gem (1,1)‐diaryl skeletons in moderate to good yields with excellent ee values. The scale‐up experiment and further derivation showed the practicality of this catalytic system. In addition, a possible catalytic cycle and transition state model was proposed to elucidate the origin of the stereoselectivity based on X‐ray crystal structure of the α‐acyloxyenamide intermediate and product
一种高度对映体选择性三组分hydroacyloxylation / 1,4-共轭加成的邻羟基苄基醇,ynamides和羧酸是在一个手性的存在下在温和的反应条件下发育N,N'二氧化物/ SC(OTF)3配合物,通过原位生成的邻苯醌甲基化物与α-酰氧基烯酰胺一起,以中等至良好的产率提供了一系列相应的含有宝石(1,1)-二芳基骨架的手性α-酰氧基酰胺衍生物,并具有出色的ee价值观。放大实验和进一步推导表明了该催化系统的实用性。此外,提出了一种可能的催化循环和过渡态模型,以基于α-酰亚氧酰胺中间体和产物的X-射线晶体结构阐明立体选择性的起源。