Issue 22, 2021

Acid-catalyzed allenylation of pyrazolones with propargyl alcohols

Abstract

A TsOH-catalyzed allenylation of pyrazolones with propargylic alcohols has been developed. The established reaction system is well tolerated by a wide scope of pyrazolones and propargylic alcohols. The process has the salient features of operational simplicity, facile scale-up and high yield. In particular, the integration of the pharmaceutical-related pyrazolone skeleton and the allenyl group into a single molecule not only enriches the structural diversity of the pyrazolone scaffold, but potentially also contributes to a broader spectrum of biological activity. Furthermore, it is easy to synthesize 3aa in gram-scale with the yield and efficiency basically maintained, making the practical application of this process more prominent.

Graphical abstract: Acid-catalyzed allenylation of pyrazolones with propargyl alcohols

Supplementary files

Article information

Article type
Paper
Submitted
28 Mar 2021
Accepted
11 May 2021
First published
12 May 2021

Org. Biomol. Chem., 2021,19, 4992-5001

Acid-catalyzed allenylation of pyrazolones with propargyl alcohols

W. Zhang, S. Wei, J. Qu and B. Wang, Org. Biomol. Chem., 2021, 19, 4992 DOI: 10.1039/D1OB00592H

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