Abstract
Site-selective C−H functionalization has emerged as an attractive tool for derivatizing complex synthetic intermediates, but its use for late-stage diversification is limited by the functional groups that can be introduced, especially at unactivated sp3-hybridized positions. To overcome this, we introduce a strategy that directly installs a sulfonyloxy group at a β-C−H bond of a masked alcohol and subsequently employs nucleophilic substitution reactions to prepare various derivatives. Hydroxyl groups are widely found in bioactive molecules and are thus readily available as synthetic handles. A directing group is easily added (and subsequently removed) from the alcohols such that a formal site-selective β-C−H sulfonyloxylation of these alcohols is achieved. Substitution reactions with carbon, nitrogen, oxygen and other nucleophiles then lead to diverse functionalizations that may help to streamline the synthesis of complex analogues for drug discovery.
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Change history
09 September 2015
In the original graphical abstract for this Article, an in-house error meant that the product structures were incorrect. This has now been corrected in all versions of the article.
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Acknowledgements
We thank the Cancer Prevention Research Institute of Texas for a start-up fund (R1118), the Welch Foundation (F-1781), Frasch Foundation and an American Chemical Society Petroleum Research Fund for research grants. G.D. is a Searle Scholar. V. Lynch is acknowledged for X-ray crystallography. We thank W. Pan for preparing substrates and M. Young for proofreading the manuscript. We also thank Johnson Matthey for a generous donation of palladium salts.
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Y.X. and G.Y. contributed equally to this work. Y.X., G.Y. and G.D. conceived and designed the experiments. Y.X., G.Y. and Z.R. performed the experiments. Y.X., G.Y. and Z.R. analysed the data. Y.X. and G.D. co-wrote the manuscript.
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Crystallographic data for compound 3c. (CIF 437 kb)
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Crystallographic data for compound 6. (CIF 2020 kb)
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Xu, Y., Yan, G., Ren, Z. et al. Diverse sp3 C−H functionalization through alcohol β-sulfonyloxylation. Nature Chem 7, 829–834 (2015). https://doi.org/10.1038/nchem.2326
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DOI: https://doi.org/10.1038/nchem.2326
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