Enantioselective Synthesis of 2‐Oxindole Spirofused Lactones and Lactams by Heck/Carbonylative Cylization Sequences: Method Development and Applications
作者:Huaanzi Hu、Fan Teng、Jian Liu、Weiming Hu、Shuang Luo、Qiang Zhu
DOI:10.1002/anie.201904838
日期:2019.7
palladium‐catalyzed asymmetric Heck/carbonylative lactonization and lactamization sequence. Diversified spirooxindole γ‐and δ‐lactones/lactams were accessed in high yields with good to excellent enantioselectivities (up to 99 % ee) under mild reaction conditions. The natural product coixspirolactam A was conveniently synthesized by applying the current methodology, and thus its absolute configuration was elucidated
通过钯催化的不对称Heck /羰基内酯化和内酰胺化序列,已经开发出了一种有效的单锅组件,该组件可以从非基于oxindole的材料中高效合成所有碳的螺-羟吲哚化合物。在温和的反应条件下,可以高收率获得多种螺氧基吲哚γ-和δ-内酯/内酰胺,对映选择性良好(至99%ee)。通过应用当前的方法方便地合成了天然产物coixspirolactamactam A,因此首次阐明了其绝对构型。有效的CRTH2受体拮抗剂的不对称合成也已在关键步骤中使用该方法得到证明。