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
,
Mingzhong Cai
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.


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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