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In a pioneering work, rhodium-catalyzed enantioselective hydrogenation of acylhydrazones derived from ketones was reported. Burk, M. J.; Feaster, J. E. J. Am. Chem. Soc. 1992, 114, 6266.
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(a) Thorn, K. F., US Patent 3615169 (1971); CA 1972, 76, 5436a.
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0002126577
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It has been shown that rare earth inflates are excellent catalysts for the catalytic activation of imine and related compounds, while most Lewis acids are decomposed or deactivated in the presence of basic nitrogen atoms. For example, (a) Kobayashi, S.; Busujima, T.; Nagayama, S. J. Chem. Soc., Chem. Commun. 1998, 19.
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26844474970
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note
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3 in a preliminary experiment.
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17
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26844524191
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note
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It is also known that the imines derived from α,β-unsaturated aldehydes are often difficult to prepare due to their instability.
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18
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0000733768
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Trost, B. M., Ed.; Chapter 4.1. Pergamon Press, Oxford
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(a) Kleinman, E. F. In Comprehensive Organic Synthesis; Trost, B. M., Ed.; Chapter 4.1. Vol. 2, Pergamon Press, Oxford, 1991, 893.
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Tramontini, M.1
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0017106240
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Other improved methods, see for example, (a) Danishefsky, S. J.; Kitahara, T.; McKee, R.; Schuda, P. F. J. Am. Chem. Soc. 1976, 98, 6715.
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(a) Guanti, G.; Narisano, E.; Banfi, L. Tetrahedron Lett. 1987, 28, 4331.
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33
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85047672030
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These problems have recently been overcome by using three-component coupling reactions of aldehydes, amines, and silyl enolates using a lanthanide triflate as a catalyst. Kobayashi, S.; Araki, M.; Yasuda, M. Tetrahedron Lett. 1995, 36, 5773.
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Kobayashi, S.1
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36
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26844476712
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note
-
3) δ 17.1, 22.46, 22.51, 23.1, 25.8, 37.9, 50.6, 67.6, 125.50, 125.55, 125.60, 125.65, 127.6, 133.7, 150.7, 164.3, 176.5.
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-
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37
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26844451320
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note
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The structure was confirmed by X-ray analysis of the corresponding N-benzoyl derivative.
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-
-
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38
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26844514846
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note
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2O (M+) 170.1419, found 170.1423.
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-
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39
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0030802072
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Cf. Overman, L. E.; Rogers, B. N.; Tellew, J. E.; Trenkle, W. C. J. Am. Chem. Soc. 1997, 119, 7159.
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Overman, L.E.1
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Tellew, J.E.3
Trenkle, W.C.4
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