Dielectrophilic Allenic Ketone-Enabled [4 + 2] Annulation with 3,3’-Bisoxindoles: Enantioselective Creation of Two Contiguous Quaternary Stereogenic Centers
作者:Xiaodong Tang、Chuan Xiang Alvin Tan、Wai-Lun Chan、Fuhao Zhang、Wenrui Zheng、Yixin Lu
DOI:10.1021/acscatal.0c05225
日期:2021.2.5
intermediates created upon phosphine activation empowered the utilization of 3,3′-bis-oxindoles as a two-carbon reaction partner in a highly enantioselective [4 + 2] annulation, allowing for facile creation of spirocyclic bisindoline structures containing two contiguous quaternary stereogenic centers. Synthetic manipulations of the [4 + 2] annulation product led to concise total synthesis of (−)-folicanthine
我们在膦介导的反应中引入了一种烯丙基酮作为介电C4合成子。膦活化后产生的高级中间体的高度亲电子性使3,3'-双-吲哚类化合物在高对映选择性[4 + 2]环空中作为两碳反应伙伴得以利用,从而可以轻松地生成包含两个相邻的第四纪立体成因中心。[4 + 2]环化产物的合成操作导致(-)-叶硫氨酸的简明全合成。