1. (a) Noyori, R. Asymmetric Catalysis in Organic Synthesis Wiley: New York, 1994; p. 82.
2. (b) Ojima, I. Catalytic Asymmetric Synthesis; VCH: New York, 1993; p. 31.
3. Spindler, F.; Blaser, H.-U. Enantioselective reduction of CN bonds and enamines with hydrogen. In Transition Metals for Organic Synthesis; Beller, M.; Bolm, C., Eds.; Wiley-VCH: Weinheim, 1998; Vol. 2, p. 69.
4. For recent publications and reviews, see: (a) Kobayashi, S.; Ishitani, H. Chem. Rev. 1999, 99, 1069.
5. (b) Cahill, J. P.; Lightfoot, A. P.; Goddard, R.; Rust, J.; Guiry, P. J. Tetrahedron: Asymmetry 1998, 9, 4307.