Abstract
The functionalization of C–H bonds in organic molecules is one of the most direct approaches for chemical synthesis. Recent advances in catalysis have allowed native chemical groups such as carboxylic acids, ketones and amines to control and direct C(sp3)–H activation1,2,3,4. However, alcohols, among the most common functionalities in organic chemistry5, have remained intractable because of their low affinity for late transition-metal catalysts6,7. Here we describe ligands that enable alcohol-directed arylation of δ-C(sp3)–H bonds. We use charge balance and a secondary-coordination-sphere hydrogen-bonding interaction—evidenced by structure–activity relationship studies, computational modelling and crystallographic data—to stabilize L-type hydroxyl coordination to palladium, thereby facilitating the assembly of the key C–H cleavage transition state. In contrast to previous studies in C–H activation, in which secondary interactions were used to control selectivity in the context of established reactivity8,9,10,11,12,13, this report demonstrates the feasibility of using secondary interactions to enable challenging, previously unknown reactivity by enhancing substrate–catalyst affinity.
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Data availability
Crystallographic data for compounds 4a, 4r, 4am, S21 and S22 are available in the Supplementary Information files and from the Cambridge Crystallographic Data Center under reference numbers CCDC 2115513, CCDC 2263719, CCDC 2263720, CCDC 2265739 and CCDC 2265740, respectively. The structures of Pd complexes C1–C3 (see Supplementary Information) are also provided under reference numbers CCDC 2236162, CCDC 2236161 and CCDC 2236160. All other data supporting the findings of this study are available in the Article and its Supplementary Information files.
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Acknowledgements
We thank the Scripps Research Institute, the NIH (National Institute of General Medical Sciences grants R01 GM084019 and F32 GM143921) and the Jennifer and Dallas Luttrell Endowed Fellowship in the Skaggs Graduate School of Chemical and Biological Sciences for their financial support. The content is solely our responsibility and does not necessarily represent the official views of the National Institutes of Health. We thank K. Wu for assistance with automated conformational searches and for numerous discussions throughout the course of this project; M. Gembicky, J. Bailey, E. Samolova and the UCSD Crystallography Facility for X-ray crystallographic analysis; L. Pasternack, D.-H. Huang and G. Kroon of the Nuclear Magnetic Resonance Facility of the Scripps Researcher Services for their assistance with NMR analysis; B. Webb and E. Billings of the Scripps Center for Metabolomics and Mass Spectrometry and J. Chen, B. Sanchez and Q. N. Wong of the Scripps Automated Synthesis Facility for assistance with mass spectrometry. We acknowledge the group of M. van Gemmeren for taking the time to independently verify the reproducibility of the results obtained in this study.
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Contributions
D.A.S. and J.-Q.Y. conceived of the project. D.A.S. developed the arylation of benzylic C–H bonds. D.A.S. and C.-Y.C. developed the arylation of cyclobutyl substrates and C.-Y.C. performed scope studies for the cyclobutyl system. H.S.P. developed the pyridone–sulfonamide ligands and performed scope studies on the benzylic arylation. D.Q.P. developed the acyl-sulfonamide ligands. D.A.S. performed the DFT studies. D.A.S. and J.-Q.Y. prepared the paper. J.-Q.Y. directed the project.
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Extended data figures and tables
Extended Data Fig. 1 Aryl iodide scope with quaternized cyclobutane alcohol 3q.
Reactions were run according to General Procedure B. The reported yields are for isolated and purified products.
Extended Data Fig. 2 Poorly performing aryl iodides and alcohol substrates.
Due to the extremely low yields or lack of detectable product formation in most of these reactions, we were unable to isolate analytically pure samples of products except where specifically noted A) Poorly performing aryl iodides. Reactions were run according to General Procedure B with modifications as indicated. Aryl iodide screening was performed using either alcohol 3q (for 1-chloro-2-iodobenzene and 1-bromo-2-iodobenzene) or alcohol 3a (for the remaining aryl iodides) as the substrate. B) Poorly performing alcohol substrates. Alcohol screening was performed using methyl-4-iodobenzoate as the coupling partner. Bolded bonds indicate relative stereochemistry. C) Products isolated in low yields from reactions run with linear alcohols. §12 mol% L27 used. &Reaction run at 0.1 M. #Reactions were run according to General Procedure A using L24 as the ligand. ^Based on crude NMR vs. CH2Br2 internal standard. *Reaction run using 0.1 mmol of methyl-4-iodobenzoate as the limiting reagent (0.1 M in DCE) with 10 equivalents of the alcohol substrate.
Extended Data Fig. 3 Logic of double mutant cycle experiments.
Double mutant cycles are a classic tool used to quantify the energy of a non-covalent interaction of interest in a complex setting, including enzyme-substrate binding and fully synthetic systems such as molecular balances and zippers50. The interaction under investigation is perturbed by removing each interacting partner (here the HBD and HBA) both individually (affording a pair of single mutants) and simultaneously (to give the double mutant). Each of these modifications will affect more than just the proposed H-bonding interaction, but the non-cooperative effects can be cancelled by adding and subtracting the energies of the four species using the equation in the figure above. The resulting energy will reflect differences in cooperative interactions between the two interacting partners across the four structures. Ideally, each mutation would fully knock out the interaction under investigation without creating any new interactions with the other partner, in which case the equation would directly report the (de)stabilization due to the interaction under investigation in the parent system. In practice, however, it can be difficult to design modifications which meet these criteria since there are many ways in which the mutated substituents could still interact cooperatively (e.g., other non-covalent interactions like dipole-dipole interactions or steric clash, or via through-bond effects, such as changes in the Lewis acidity of the metal center). Thus, double mutant cycles must be designed carefully to ensure that they provide information about the interaction of interest rather than other cooperative interactions. To address the potential for confounding factors, we have calculated four double mutant cycles each for TS-1, TS-δ-1, TS-cis-γ-1, and TS-trans-γ-1 (see Extended Data Fig. 4 and Figs. S78, S83, and S88 for details, discussion, and tabulated energies and Figs. 4e and S71–S77, S79–S82, and S84–S87 for the actual cycles) employing different mutations designed to have very different potential confounding factors. The qualitative agreement between these models provides strong support for significant stabilization by the proposed H-bonding interaction.
Extended Data Fig. 4 Summary of computational double mutant cycles examined for benzylic C–H activation.
A) The HBA can be knocked out by replacing the acyl sulfonamide with a carboxylate or an amidate. The amidate preserves the identity of the chelating atom, but may significantly alter the electronics at Pd, whereas the carboxylate is more similar to the acyl sulfonamide electronically but changes the atom bound to Pd. B) The HBD can be knocked out by replacing the directing group with a methyl ether or an alkoxide. The methyl ether preserves the charge and nature of the directing group, but significantly alters the steric properties of the directing group, whereas the alkoxide significantly alters the electronic character of the directing group, but presents a similar steric profile to the alcohol. C) Tabulated data for the four cycles generated by the pairwise combinations of the ligand and substrate mutations described above (the tabulated data is taken from the cycles shown in Figs. 4e and S71–S73). While there are modest quantitative differences in the interaction energy measured for each cycle, they are all in qualitative agreement on the stabilization afforded by the interaction between the alcohol and the sulfonamide. Since the four cycles were chosen to have different potential confounding factors, the qualitative agreement strongly suggests that the observed stabilization is due at least in large part to the proposed H-bonding interaction.
Supplementary information
Supplementary Information
Hydrogen-bond-acceptor ligands enable distal C(sp3)–H arylation of free alcohols
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Strassfeld, D.A., Chen, CY., Park, H.S. et al. Hydrogen-bond-acceptor ligands enable distal C(sp3)–H arylation of free alcohols. Nature 622, 80–86 (2023). https://doi.org/10.1038/s41586-023-06485-8
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DOI: https://doi.org/10.1038/s41586-023-06485-8
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