Enantioselective Hydrogenation of b-Keto Esters
FULL PAPERS
2
1
1
7
4
900 m, 2797 s, 1593 s, 1543 s, 1509 s, 1478 w, 1440 m, 1417 m,
358 s, 1331 w, 1249 w, 1225 m, 1209 w, 1180 m, 1097 s,
062 w, 1023 w, 945 w, 938 w, 865 w, 828 s, 795 m, 773 w, 751 s,
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pin, J. A. Laffitte, Tetrahedron: Asymmetry 1994, 5, 675–
À1
33 w, 670 w, 619 w, 567 w, 519 cm m; MS (ESI): m/z (%)¼
þ
32 ([M ], 100), 311, 283 (1), 277 (10), 265 (7), 166 (3), 151
(
5), 121 (9), 91 (3), 77 (2), 42 (2); HR-MS: calcd. for
22
C H NP: 431.1824; found: 431.1803; optical rotation: [a] :
À251 (c 0.05, toluene).
30
26
6
90.
[
[
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Acknowledgements
The authors thank M. Heyken, H. Baudisch, Dr. W. Baumann,
S. Buchholz, Dr. H. Klein and Dr. C. Fischer (all IfOK) for an-
alytical and technical support. Prof. Dr. Serafino Gladiali is
thanked for general discussions. Generous financial support
of this project from the state Mecklenburg-Western Pomerania,
the Fonds der Chemischen Industrie (FCI), and the Bundesmi-
nisterium für Bildung und Forschung (BMBF) is gratefully ac-
knowledged.
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