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These pyrrolidines are readily accessible from the commercially available and inexpensive (S)-trans-4-hydroxyproline in few routine steps, an additional aspect of the model, that is of practical interest. For a review on trans-4-hydroxy-L-prolines, see: P. Remuzon, Tetrahedron 1996 52 13803-13835;
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also see the Supporting Information for details. [35] It has been recently found that an acetaldehyde-based Mannich reaction with aromatic aldehyde-derived benzoyl imines promoted by a diarylprolinol silyl ether is activated by the aid of a Brønsted acid. For details, see: a) Y. Hayashi, T. Okano, T. Itoh, T. Urishima, H. Ishikawa, T. Uchimaru, Angew. Chem. 2008 120 9193-9198;
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CCDC-726915 contains the supplementary crystallographic data for the structural analysis of 29 a. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data-request/cif
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See the Supporting Information for further details.
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See the Supporting Information for further details.
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