Chinese Journal of Organic Chemistry    

ARTICLE

钯/膦配合物催化Morita-Baylis-Hillman碳酸酯与氮杂二烯的(4 + 4)环化反应

朱波, 杨杨, 刘淇尹, 杜玮*, 陈应春*   

  1. 四川大学华西药学院 成都 610041
  • 收稿日期:2024-05-15 修回日期:2024-06-21
  • 基金资助:
    国家自然科学基金(No. 21971166)资助项目.

Palladium/Phosphine Complex-Catalyzed (4 + 4) Annulations of Morita-Baylis-Hillman Carbonates and 1-Azadienes

Zhu Bo, Yang Yang, Liu Qiyin, Du Wei*, Chen Yingchun*   

  1. West China School of Pharmacy, Sichuan University, Chengdu, 610041
  • Received:2024-05-15 Revised:2024-06-21
  • Contact: *E-mail: ycchen@scu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (No. 21971166).

Here we report a (4 + 4) annulation reaction for the construction of medium-sized N-heterocycles. This process involves the generation of all-carbon 1,4-dipoles containing a π-allylpalladium complex from Morita-Baylis-Hillman (MBH) carbonates under the catalysis of Pd/Synphos, which then undergo Michael addition/N-allylic alkylation with 1-azadienes. A spectrum of eight-membered N-heterocycles featuring a trisubstituted exo-cyclic double bond are furnished efficiently, with moderate to good E/Z selectivity and moderate atroposelectivity. In addition, moderate enantioselectivity can be realized by using a chiral ligand or with the assistant of a chiral quaternary ammonium salt.

Key words: palladium/phosphine complex, Morita-Baylis-Hillman carbonates, all-carbon 1,4-dipoles, (4 + 4) annulation, eight-membered N-heterocycles