Stereoselective synthesis of highly congested tetralin-fused spirooxindoles with hydroxy group: Pseudo oxygen atom induced hydride shift/cyclization process
作者:Dan Sakai、Mizuki Machida、Keiji Mori
DOI:10.1016/j.tetlet.2021.153408
日期:2021.10
A highly stereoselective synthesis of tetralin-fused spirooxindoles with two contiguous stereogenic centers was developed. In the present reaction, not only the [1,5]-hydride shift/cyclization process, but also the replacement of nitrogen atom by oxygen atom occurred smoothly to give target compounds with hydroxy group in good chemical yields with good to excellent diastereoselectivities (up to d.r
开发了具有两个连续立体中心的四氢萘融合螺吲哚的高度立体选择性合成。在本反应中,不仅[1,5]-氢化物转移/环化过程,而且氮原子被氧原子取代,以良好的化学产率得到具有羟基的目标化合物,具有良好到优异的非对映选择性(高达博士 = > 20:1)。对反应机理的研究表明,这种“原子置换”事件是通过亚胺阳离子中间体发生的。