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2005
Enantioselective syntheses
O 0031
Unsymmetrical Hybrid Ferrocene-Based Phosphine-Phosphoramidites: A New
of Practical Ligands for Rh-Catalyzed Asymmetric Hydrogenation. — The
04- 030 Class
title catalysts are prepared and applied in the Rh-catalyzed hydrogenation of enamides
(II), dimethyl itaconate (IV), and methyl (Z)-acetamidocinnamate (VI) affording the
corresponding products with the highest levels of enantioselectivity reached so far for
bidentate phosphine-phosphoramidite ligands. The reactions are solvent-independent
and are effective even with low loading of the catalyst. The ligand stays effective after
being held at ambient temperature in open air for more than 6 months, allowing to perform the reaction under unprotected conditions. — (HU, X.-P.; ZHENG*, Z.; Org.
Lett. 6 (2004) 20, 3585-3588; Dalian Inst. Chem. Phys., Chin. Acad. Sci., Dalian
116023, Peop. Rep. China; Eng.) — Steudel
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