Synthesis 2024; 56(20): 3220-3232
DOI: 10.1055/a-2360-8289
paper

Palladium-Catalyzed Asymmetric Allylic Alkylation of Azlactones: An Efficient Access to Unsaturated Trifluoromethylated α-Amino Acid Derivatives Possessing α-Quaternary Stereogenic Centers

Authors

  • Shuaibo Zhang

    a   State Key Laboratory of Fine Chemicals, Department of Pharmaceutical Sciences, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. of China
  • Luyang Sun

    b   State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. of China
  • Dong Li

    a   State Key Laboratory of Fine Chemicals, Department of Pharmaceutical Sciences, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. of China
  • Jinfeng Zhao

    c   Instrumental Analysis Center, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. of China
  • Jingping Qu

    b   State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. of China
  • Yuhan Zhou

    a   State Key Laboratory of Fine Chemicals, Department of Pharmaceutical Sciences, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. of China

Financial support for this work was provided by the National Natural Science Foundation of China (Grant Nos. 21878037, 22278060).


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Abstract

A new strategy for the asymmetric allylic alkylation of azlactones with α-(trifluoromethyl)allyl acetates catalyzed by Pd(OAc)2/(R)-BINAP is designed and developed, providing access to unsaturated α-quaternary α-amino acid derivatives bearing a trifluoromethyl group and contiguous quaternary and tertiary stereogenic centers. The products are obtained in good yields with exclusive regioselectivity and excellent stereoselective control under relatively mild reaction conditions. A scale-up experiment shows no loss of reactivity or stereoselectivity. The synthetic utility of the current strategy is demonstrated through transformations of a representative product to afford several potentially bioactive species.

Supporting Information



Publikationsverlauf

Eingereicht: 10. Juni 2024

Angenommen nach Revision: 04. Juli 2024

Accepted Manuscript online:
04. Juli 2024

Artikel online veröffentlicht:
29. Juli 2024

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