Inverse‐Electron‐Demand Palladium‐Catalyzed Asymmetric [4+2] Cycloadditions Enabled by Chiral P,S‐Ligand and Hydrogen Bonding
作者:Ya‐Ni Wang、Qin Xiong、Liang‐Qiu Lu、Qun‐Liang Zhang、Ying Wang、Yu Lan、Wen‐Jing Xiao
DOI:10.1002/anie.201905993
日期:2019.8.5
intermediates with deconjugated butenolides and azlactones were accomplished by using a novel chiral hybrid P,S‐ligand and hydrogen bonding. By doing so, highly functionalized, optically active dihydroquinol‐2‐ones were produced with generally high reaction efficiencies and selectivities. Preliminary DFT calculations were performed to explain the high enantio‐ and diastereoselectivities.
含钯的偶极物质与亲核性的偶极亲和剂的催化不对称环加成反应,即反电子需求环加成反应,具有挑战性,并且开发不足。Pd催化的分子间烯丙基化的固有线性选择性和缺乏有效的手性配体可能是造成这一局限性的原因。在本文中,通过使用新型手性杂化P,S-配体和氢键,实现了此类中间体与去共轭的丁烯内酯和a内酯的两个环加成反应。通过这样做,可以生产出具有高官能度的旋光性二氢喹啉-2-酮,它们通常具有很高的反应效率和选择性。进行了初步的DFT计算,以解释高对映选择性和非对映选择性。