Copper(I) zeolites as heterogeneous and ligand-free catalysts: [3+2] cycloaddition of azomethine imines.
Copper(I)-exchanged zeolites were used as heterogeneous ligand-free catalysts for [3+2] cycloaddition of azomethine ylides, which allows versatile, efficient, and highly regioselective synthesis of pyrazolone derivatives. These cheap and easy-to-prepare catalysts exhibit wide scope and compatibility with functional groups. They are very simple to use, easy to remove (by simple filtration), and recyclable (up to six times without loss of activity).
Keller
Murielle
M
Laboratoire de Physicochimie des Hydrocarbures, Institut de Chimie de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France.
Sido
Abdelkarim Sani Souna
AS
Pale
Patrick
P
Sommer
Jean
J