Synthesis 2024; 56(23): 3637-3645
DOI: 10.1055/s-0043-1775404
paper

Recyclable Pd(OAc)2/2P(3-tol)3/PEG-400 System for Regio- and Stereoselective Addition of Boronic Acids to Ynamides

Li Wei
,
Rong Liu
,

We thank the National Natural Science Foundation of China (No. 21664008) and Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education (No. KFSEMC-202206) for financial support.


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Abstract

Pd(OAc)2/2P(3-tol)3 in poly(ethylene glycol) (PEG-400) is shown to be a highly efficient catalyst for the regio- and stereoselective addition of boronic acids to ynamides. The reaction proceeds smoothly at 70 °C with Na2CO3 as base, delivering a variety of (Z)-α,β-disubstituted enamides in good to excellent yields with high regio- and stereoselectivity. The isolation of the crude products can be facilely performed by extraction with diethyl ether and more importantly, the Pd(OAc)2/2P(3-tol)3/PEG-400 system could be readily recycled and reused more than six times without any significant loss of its catalytic efficiency.

Supporting Information



Publication History

Received: 13 July 2024

Accepted after revision: 29 August 2024

Article published online:
25 September 2024

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