Copper‐Complex‐Catalyzed Asymmetric Aerobic Oxidative Cross‐Coupling of 2‐Naphthols: Enantioselective Synthesis of 3,3′‐Substituted
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C
<sub>1</sub>
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‐Symmetric BINOLs
作者:Jin‐Miao Tian、Ai‐Fang Wang、Ju‐Song Yang、Xiao‐Jing Zhao、Yong‐Qiang Tu、Shu‐Yu Zhang、Zhi‐Min Chen
DOI:10.1002/anie.201903435
日期:2019.8.5
A novel chiral 1,5‐N,N‐bidentate ligand based on a spirocyclic pyrrolidine oxazoline backbone was designed and prepared, and it coordinates CuBr in situ to form an unprecedented catalyst that enables efficient oxidative cross‐coupling of 2‐naphthols. Air serves as an external oxidant and generates a series of C1‐symmetric chiral BINOL derivatives with high enantioselectivity (up to 99 % ee) and good
设计并制备了一种基于螺环吡咯烷恶唑啉骨架的新型手性1,5-N,N-双齿配体,它可原位配位CuBr形成前所未有的催化剂,可实现2-萘酚的有效氧化交叉偶联。空气充当外部氧化剂,并生成一系列具有高对映选择性(高达99%ee)和良好的产率(高达87%)的C 1对称手性BINOL衍生物。这种方法可耐受更广泛的底物范围,尤其是带有各种3'和3'取代基的底物。使用获得的C 1之一进行初步调查对称的BINOL产品用作有机催化剂,对氨基酯的不对称α-烷基化反应表现出比以前报道的有机催化剂更好的对映选择性。