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See for example: (a) Damon, R. E.; Coppola, G. M. Tetrahedron Lett. 1990, 31, 2849. (b) Some success has been obtained using α,β;-unsaturated oxazolidinones as dienophiles at r.t. under high pressure in the presence of chiral Lewis acids: Knol, J.; Meetsma, A.; Feringa, B. L. Tetrahedron: Asymmetry 1995, 6, 1069; and references cited therein.
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1642307655
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note
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CCDC No. 217034 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 CCDC 12 Union Road Cambridge CB2 1EZ UK; fax: 444(1223)336033; e-mail: deposit@ccdc.cam.ac.uk].
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(a) In all cases only one isomer was observed in the NMR spectrum (after removal of the Boc group) or by HPLC. Reductive amination of cyclic ketones in these conditions is usually not selective: Hutchins, R. O.; Su, W.-Y.; Sivakumar, R.; Cistone, F.; Stercho, Y. P. J. Org. Chem. 1983, 48, 3412.
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