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2005
Aminocarboxylic acids (hydrazinocarboxylic acids) and esters
Q 0440
Synthesis of Monodentate Chiral Spiro Phosphonites and the Electronic Effect of
in Asymmetric Hydrogenation. — Phosphonites (I) are highly effective
12- 086 Ligand
ligands for the Rh-catalyzed asymmetric hydrogenation of α- and β-dehydroamino acid
derivatives. The ligand (Ic) affords the best results. A variety of substrates are successfully hydrogenated under the optimized conditions to give products (III) and (IV) in
high yields and excellent enantioselectivities. Particularly remarkable is the efficiency
of the Rh/spirophosphonite catalysts in the hydrogenation of (Z)/(E)-isomeric mixtures
of esters (IV). — (FU, Y.; HOU, G.-H.; XIE, J.-H.; XING, L.; WANG, L.-X.; ZHOU*,
Q.-L.; J. Org. Chem. 69 (2004) 23, 8157-8160; State Key Lab. Elem.-Org. Chem.,
Nankai Univ., Tianjin 300071, Peop. Rep. China; Eng.) — Klein
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