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29
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13444280084
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note
-
We have already found that NMI is an effective additional ligand in zirconium-catalyzed enantioselective reactions. See, for example, ref. [9 b,c].
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30
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1642415515
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Recently, several "direct" asymmetric Mannich-type reactions have been reported; however, to our knowledge, there is no example using simple esters as nucleophiles. In the present method, highly enantioselective reactions of simple ester enolates with imines have been achieved. For "direct" Mannich-type reactions, see a review: a) A. Cordova, Acc. Chem. Res. 2004, 37, 102;
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For examples using modified esters, see: l) L. Bernardi, A. S, Gothelf, R. G. Hazell, K. A. Jørgensen, J. Org. Chem. 2003, 68, 2583;
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CCDC-251938 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/ retrieving.html (or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB21EZ, UK; fax: (+44)1223-336-033; or deposit@ ccdc.cam.ac.uk).
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