Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (8): 20220131.doi: 10.7503/cjcu20220131

• Physical Chemistry • Previous Articles     Next Articles

Organocatalytic Enantioselective Mannich-type Addition of 5H-Oxazol-4-ones to Isatin Derived Ketimines

HUANG Qiuhong1, LI Wenjun2(), LI Xin1,3()   

  1. 1.College of Chemistry,Nankai University,Tianjin 300071,China
    2.Department of Medicinal Chemistry,School of Pharmacy,Qingdao University,Qingdao 266021,China
    3.Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China
  • Received:2022-03-03 Online:2022-08-10 Published:2022-03-20
  • Contact: LI Wenjun,LI Xin E-mail:liwj@qdu.edu.cn;xin_li@nankai.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22193011)

Abstract:

Chiral 3,3′-disubstituted oxindoles are widely present in a variety of natural products and bioactive molecules. And the nature of substituents and the absolute configuration of the stereo center at the C3 position have a great effect on the bioactivities of these chiral oxindoles. Therefore, it is of great significance to develop efficient and practical methods to construct chiral 3,3′-disubstituted oxindole compounds. In particular, the enantioselective Mannich-type addition of isatin derived imines is one of the most straightforward method for forging chiral 3,3′-disubstituted oxindole compounds. Based on previous experiments, it was found that the 5H-oxazol-4-ones, which had diverse reactive sites and could be easily converted into important α-alkyl-α-hydroxy derivatives, were potential candidate nucleophile for enantioselective Mannich-type addition reaction. Herein, we reported the first chiral phosphoric acid catalyzed enantioselective Mannich-type addition reaction of isatin derived ketimines with 5H-oxazol-4-ones. Various of electron-withdrawing or electron-donating substituted isatin derived ketimines and 5H-oxazol-4-ones. Various of electron-withdrawing or electron-donating substituted isatin derived ketimines and 5H-oxazol-4-ones could be better adapt to the reaction conditions to construct chiral 3,3′-disubstituted oxindole compounds with good to excellent yields(up to 97%), enantioselectivities(up to 99% e.e.) and diastereoselectivities(all>20∶1 d.r.). What’s more, the reaction could be scaled up, and the synthetic utility of the desired chiral 3,3′-disubstituted oxindoles was proved by transformations.

Key words: Organocatalysis, Isatin derived ketimine, 5H-oxazol-4-one, Mannich-type addition reaction, Chiral 3, 3′-disubstituted oxindoles

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