Technical Notes:
1. The Noyori(diphosphine) RuClz (diamine)catalysts containing the chiral ligand Xylyl-Phanephos display exceptional activity and enantioselectivity in the asymmetric hydrogenation of a wide range of aromatic, heteroaromatic and a,?-unsaturatedketones.
2.Reactions are performed under mild conditions at room temperature and typically at low Hz pressures of 2-10 bar. substrate concentrations of up to 40% w/v are tolerated
3.Molar substrate/catalyst ratios of up to 1 00,000/1 are achieved with excellent reactivity and enantioselectivity using commercial grade substrates and solvents.
References:
1.Org. Lett.. 2000, 2. 4173.
2.Burk, M.J.; Hems. w.; Zanotti-Gerosa, A. PCT WO/0 174829 A1, 2001.
3.Org. Proc. Res. Dev.. 2003, 7, 89.
Strem
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