Page 186 - Catalysts for Fine Chemical Synthesis Vol 1 - Robert & Poignant

asymmetric reduction using nonmetallic catalysts 173

20. The B-methyl catalysts were prepared by reacting the aminoalcohol with trimethyl-
boroxine, followed by an azeotropic distillation with toluene.
21. For the synthesis of 2-chlorosulfonyl pyridine see: Diltz, S., Aguirre, G., Ortega, F.,
Walsh, P.J. Tetrahedron: Asymmetry, 1997, 8, 3559.
22. For a comprehensive and excellent review see: Corey, E.J., Helal, C. Angew. Chem.
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23. Sibi, M.P., Cook, G.R., Liu, P. Tetrahedron Lett., 1999, 40, 2477.
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25. (a) Kohra, S., Hayashida, H., Tominaga, Y., Hosomi, A. Tetrahedron Lett., 1988,
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26. Laronde, F.J., Brook, M.A. Tetrahedron Lett., 1999, 40, 3507.
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1983, Vol. 1, p 128; Niwa, H., Ogawa, T., Okamato, O., Yamada, K. Tetrahedron,
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28. LaRonde, F.J., Brook, M.A. Stereoselective Reduction of Ketones Using Extracoor-
dinate Silicon: C 2 -Symmetric Ligands, Inorganica Chim. Acta.
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rison, J.D., Ed., Academic: New York, 1983, pp. 219±21. Proline in aldol reactions:
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