Design and synthesis of a new type of ferrocene-based planar chiral DMAP analogues. A new catalyst system for asymmetric nucleophilic catalysis |
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Authors: | Seitzberg Jimmi Gerner Dissing Carsten Søtofte Inger Norrby Per-Ola Johannsen Mogens |
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Affiliation: | Department of Chemistry, Technical University of Denmark, Buildings 201 and 206, DK-2800 Kgs. Lyngby, Denmark. |
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Abstract: | A new first-generation catalyst system for nucleophilic catalysis has been developed. It is based on a planar chiral ferrocene skeleton with either the potent nucleophile 4-(dimethylamino)pyridine (DMAP) or the related 4-nitropyridine N-oxide attached in either the 2- or the 3-position. The syntheses are short, efficient, and enantioselective and X-ray crystal structures of both DMAP-derived catalysts are presented. The DMAP-based catalysts were tested in asymmetric reactions and the 3-derivative 14 showed good activity and a moderate level of enantioselectivity. The sense of induction (selectivity) was studied using molecular modeling and the results pointed at new directions for future generations of catalysts based on this design. |
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