Synthesis of spiro diphosphines and their application in asymmetric hydrogenation of ketones

J Am Chem Soc. 2003 Apr 16;125(15):4404-5. doi: 10.1021/ja029907i.

Abstract

Synthesis of chiral diphosphine ligands containing a spiro scaffold was described. The ruthenium complexes of these spiro ligands were found to have extremely high activities (S/C up to 100 000) and enantioselectivities (ee up to 99.5%) in the asymmetric hydrogenation of aromatic, heteroaromatic, and alpha,beta-unsaturated ketones.