1. For examples see: (a) Zhu, Y.Z.; Li, Z.P.; Ma, J.A.; Tang, F.Y.; Kang, L.; Zhou, Q.L.; Chan, A. S. C.Tetrahedron: Asymmetry2002,13, 161. (b) Maruoka, K.; Murase, N.; Yamamoto, H.J. Org. Chem.1993,58, 2938. (c) End, N.; Pfaltz, A.Chem. Commun.1998, 589. (d) End, N.; Macko, L.; Margareta, Z.; Pfaltz, A.Chem. Eur. J.1998,4, 818. (e) Guo, C.; Qui, J.; Zhang, X.; Verdugo, D.; Larter, M. L.; Christie, R.; Kenney, P.; Walsh, P. J.Tetrahedron1997,53, 4145. (f) Seitz, M.; Kaiser, A.; Stempfhuber, S.; Zabel, M.; Reiser, O.Inorg. Chem.2005,44, 4630.
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