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2005
Hydrogenation
O 0220
An Efficient Method for the Synthesis of Enantiopure Phosphine—Imidazoline
Application to the Ir-Catalyzed Hydrogenation of Imines. — Novel
11- 062 Ligands:
arylimidazolines (I), obtained efficiently via reaction of aryldithioesters with chiral
diamines, are used as ligands in the asymmetric iridium-catalyzed hydrogenation of
imines to amines. Although excellent conversions are achieved, the enantioselectivity
is only low to moderate and cannot be improved by use of various additives like Bu4NI,
phthalimide or iodine. The electronic properties of the imidazolines (I), however, can
be influenced by the N-substituent, which will be an interesting subject of further studies. — (GUIU, E.; CLAVER, C.; BENET-BUCHHOLZ, J.; CASTILLON*, S.;
Tetrahedron: Asymmetry 15 (2004) 21, 3365-3373; Dep. Quim. Anal. Quim. Org.,
Univ. Rovira Virgili, E-43005 Tarragona, Spain; Eng.) — Mischke
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