Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2021, Issue 26, Pages 3676-3680Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.202100634
Keywords
Amino alcohols; Copper; Multicomponent reactions; Oxazolidines; Ring-opening alkynylation
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The application of multicomponent reactions in organic synthesis is a versatile strategy to achieve molecular diversity. In this study, a copper-catalyzed process for the selective synthesis of N-propargyl oxazolidines and N,N-dipropargyl vicinal amino alcohols was disclosed. The mechanism involves a sequential process of copper-catalyzed annulation/A(3)-coupling and copper-catalyzed ring-opening alkynylation.
The application of multicomponent reactions has been recognized as the most versatile strategy to achieve molecular diversity in organic synthesis. The reaction pathway and selectivity control of multicomponent reactions are associated with the effectiveness, the economy, and cleanliness of the process. Herein, a copper-catalyzed switchable process for the selective synthesis of N-propargyl oxazolidines and N,N-dipropargyl vicinal amino alcohols, by propargylation of amino alcohols, is disclosed. Mechanistic studies support a sequential process involving a copper-catalyzed annulation/A(3)-coupling of amino alcohol, and copper-catalyzed ring-opening alkynylation of the oxazolidine intermediate. Notably, the iodide anion would not affect the generation of oxazolidines, but it could shut down the cascade procedure of the alkynylation of these oxazolidines.
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