Ruthenium(II)-catalyzed cycloaddition of 1,6-diynes with isocyanates leading to bicyclic pyridones.
[reaction: see text] A ruthenium(II) complex possessing a planar Cp ligand, CpRu(cod)Cl, effectively catalyzed the [2 + 2 + 2] cycloaddition of 1,6-diynes with isocyanates to afford bicyclic pyridones in 58-87% yields.
Yamamoto
Y
Y
Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan.
Takagishi
H
H
Itoh
K
K