Abstract
Methods to form carbon–carbon bonds efficiently and with control of stereochemistry are critical for the construction of complex molecules. Cross-coupling reactions are among the most efficient and widely used reactions to construct molecules, with reactions enabling the retention or installation of chirality as recent additions to this powerful toolbox. Sulfones are robust, accessible organic electrophiles that have many attractive features as cross-coupling partners; however, since the first example of their use in 1979, there have been no examples of their use in enantioselective, enantiospecific or entantioconvergent cross-couplings. The high acidity of sulfones makes it unclear whether this transformation is even possible outside tertiary systems. Here we report the enantiospecific cross-coupling of cyclic sulfones and Grignard reagents. Up to 99% chirality transfer is observed despite the strong basicity of the Grignard components. In situ monitoring reveals that the cross-coupling is kinetically competitive with competing deprotonation, resulting in a highly enantioselective transformation.
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Data availability
Crystal structure data for (S)-1a, [NiBr2(DMPMA)]2 and (R)-17 have been deposited at the Cambridge Crystallographic Data Centre (CCDC 2298851-2298853), and crystallographic data are provided in Supplementary Information. Additionally, the spectroscopic, mass spectrometric, chromatographic and kinetic data that support the findings of this study are also available in Supplementary Information.
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Acknowledgements
This work was supported by a Grants-in-Aid for Scientific Research (KAKENHI) from the Japan Society for the Promotion of Science (JSPS) (17K17805 and 21K05068 to M.N.). S.S. thanks the Baden-Württemberg-Stiftung for funding. J.A. and S.S. also thank the support of the Stuttgart-Queen’s Dual MSc Degree Program. C.M.C. and R.N.-S. acknowledge the Natural Science and Engineering Research Council of Canada (NSERC) and the Canada Foundation for Innovation (CFI) for funding. Z.T.A. thanks Queen’s University for funding. JSPS and Nagoya University are acknowledged for funding of this research through The World Premier International Research Initiative (WPI) program. The authors also wish to thank F. Sauriol (NMR), K. McEleney (high resolution mass spectrometry), G. Schatte (XRD), J. Wang (high resolution mass spectrometry) and A. D. Erlich (reaction monitoring assistance).
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M.N. and C.M.C. conceived the concept and supervised the project. R.N.-S., Z.T.A., S.S. and J.A. developed the methodology, optimized cross-coupling conditions and examined the scope of the reaction. Y.T. separated enantiomers of racemic substrates. R.N.-S. developed strategies that enabled the study of the catalytic mechanism (NMR and e.e. monitoring). R.N.-S. and Z.T.A grew samples for XRD. D.Y. and M.N. carried out DFT calculations. R.N.-S., Z.T.A, M.N. and C.M.C. wrote the manuscript with assistance from the co-authors.
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Supplementary Information
Supplementary methods, Figs. 1–146, Tables 1–6 and references.
Supplementary Data 1
Optimized Cartesian coordinates (CAM-B3LYP) for the calculated structures for (S)-1a, 18, 19-anti, 19-syn, 20, 21, TS_inversion and TS_retention.
Supplementary Data 2
Crystallographic data for compound (S)-1a, CCDC reference 2298851.
Supplementary Data 3
Crystallographic data for compound [NiBr2(DMPMA)]2, CCDC reference 2298852.
Supplementary Data 4
Crystallographic data for compound (R)-17, CCDC reference 2298853.
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Nolla-Saltiel, R., Ariki, Z.T., Schiele, S. et al. Enantiospecific cross-coupling of cyclic alkyl sulfones. Nat. Chem. 16, 1445–1452 (2024). https://doi.org/10.1038/s41557-024-01594-x
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DOI: https://doi.org/10.1038/s41557-024-01594-x
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