Highly efficient iridium catalyst for asymmetric transfer hydrogenation of aromatic ketones under base-free conditions.
[reaction: see text] Catalytic systems generated in situ from the chiral PNNP ligands with iridium or rhodium hydride complexes exhibited excellent catalytic activity and good enantioselectivity in the asymmetric transfer hydrogenation of aromatic ketones without added base. The best result was obtained in the IrH(CO)(PPh(3))(3)-ligand 2 catalytic system with up to 99% yield and 97% ee.
Dong
Zhen-Rong
ZR
State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China.
Li
Yan-Yun
YY
Chen
Jian-Shan
JS
Li
Bao-Zhu
BZ
Xing
Yan
Y
Gao
Jing-Xing
JX