A family of highly active copper(I)-homoscorpionate catalysts for the alkyne cyclopropenation reaction.
Equimolar mixtures of ethyl diazoacetate and alkynes can be converted into cyclopropenes in very high yields, at room temperature, through the intermediacy of readily available Cu(I) catalysts containing trispyrazolylborate ligands.
Díaz-Requejo
M M
MM
Departamento de Química y Ciencia de Materiales, Universidad de Huelva, Carretera de Palos de la Frontera s/n, E-21819 Huelva, Spain.
Mairena
M A
MA
Belderrain
T R
TR
Nicasio
M C
MC
Trofimenko
S
S
Pérez
P J
PJ