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研究论文

蒽光二聚体衍生的手性单膦配体:借助化学拆分的制备路线和不对称烯丙基胺化的合成应用

任天磊a,b, 汪鑫a,b, 丛欢*,a,b   

  1. a中国科学院理化技术研究所 中国科学院光化学转换与功能材料重点实验室 北京 100190;
    b中国科学院大学 北京 100049
  • 收稿日期:2024-09-12 修回日期:2024-10-31
  • 基金资助:
    国家自然科学基金(Nos. 22071257,92356307)和中国科学院理化技术研究所所长基金资助项目.

Anthracene Photodimer-Derived Chiral Monophosphine Ligands: Preparative Route through Chemical Resolution and Synthetic Application in Asymmetric Allylic Amination

Ren Tian-Leia,b, Wang Xina,b, Cong Huan*,a,b   

  1. aCAS Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190;
    bUniversity of Chinese Academy of Sciences, Beijing, 100049
  • Received:2024-09-12 Revised:2024-10-31
  • Contact: * E-mail: hcong@mail.ipc.ac.cn
  • Supported by:
    National Natural Science Foundation of China (Nos. 22071257, 92356307) and TIPC Director’s Fund.

蒽光二聚体具有前手性骨架,因此可作为构筑新型手性配体的核心结构。此前工作中具备光学活性的蒽光二聚体衍生的单膦配体均由高效液相色谱拆分得到,成为制约合成规模与成本控制的瓶颈。本文发展了一种基于化学拆分、廉价且易于操作的配体合成新路线。该路线的特点是利用脯氨酸衍生的手性辅基,成功实现对1-氨基取代的蒽光二聚体的化学拆分,进而利用拆分后的光学纯对映异构体,针对一系列蒽光二聚体衍生的单膦配体进行发散式地合成。经过上述化学拆分路线合成的手性单膦配体(Sa, Sp)-L1被应用于钯催化的不对称烯丙基胺化反应,适用于多种不同取代的芳胺类亲核试剂,并且具有高产率和对映选择性。

关键词: 蒽光二聚体, 手性单膦配体, 化学拆分, 烯丙基胺化, 钯催化

Anthracene photodimer has a prochiral skeleton, which can be employed as the core structure to construct new chiral ligands. In previous works, the monophosphine ligands derived from optically active anthracene photodimer were prepared through resolution using high performance liquid chromatography, which became a bottleneck for the synthetic scale and cost control. Herein, we report an inexpensive and operationally friendly route for these ligands, based on chemical resolution. The route features the use of a proline-derived chiral auxiliary that facilitate successful chemical resolution of 1-amino substituted anthracene photodimer. From the resulting optically pure enantiomers, divergent syntheses of a series of anthracene photodimer-derived monophosphine ligands have been achieved. Prepared from the above route, the chiral monophosphine ligand (Sa, Sp)-L1 has been applied to palladium-catalyzed asymmetric allylic amination reactions, which are suitable for a wide range of aniline-type nucleophiles with high yield and enantioselectivity.

Key words: anthracene photodimer, chiral monophosphine ligand, chemical resolution, asymmetric allylic amination, palladium catalysis