Asymmetric catalysis of metal complexes with non-planar ONNO ligands: salen, salalen and salan.
Chiral metal (M)-salen complexes are one of the most versatile asymmetric catalysts and the catalysis of trans-M(salen) complexes has been well cultivated. On the other hand, non-planar cis-beta M(salen) complexes were recently found to show unique asymmetric catalysis that cannot be attained by trans-M(salen) complexes. Moreover, related non-planar M(salalen) and M(salan) complexes were also found to exert unprecedented asymmetric catalysis. This Feature Article summarizes the seminal studies on asymmetric catalysis of non-planar M(ONNO) complexes, full utilization of which will provide marked improvement in asymmetric synthesis.
Matsumoto
Kazuhiro
K
Department of Chemistry, Faculty of Science, Graduate School, Kyushu University, Hakozaki, Fukuoka, 812-8581, Japan.
Saito
Bunnai
B
Katsuki
Tsutomu
T