Abstract
Chiral catalyst development is a key to asymmetric catalysis research. The enantioselectivity of a chiral catalyst relies on its ability to distinguish the prochiral centres or faces of substrates, which is difficult when the two groups attached to the centre or face are spatially and electronically similar. For example, dialkyl ketones are difficult to reduce enantioselectively. Here we report a protocol for the highly enantioselective hydrogenation of dialkyl ketones catalysed by a rationally designed chiral spiro iridium complex. The tridentate spiro structure and the bulky phosphino groups of the chiral ligand imparted a remarkable stability and enantioselectivity to the catalyst. The protocol is highly efficient for generating chiral aliphatic alcohols, and has potential for a wide application in pharmaceuticals and fine chemicals.

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Data availability
Data relating to the materials and methods, optimization studies, experimental procedures, DFT calculations, HPLC spectra, GC spectra and NMR spectra are available in the Supplementary Information. Crystallographic data for catalyst (R)-Cat1 is available free of charge from the CCDC under reference number 1913872. All other data are available from the authors upon reasonable request.
Change history
17 February 2021
A Correction to this paper has been published: https://doi.org/10.1038/s41929-020-00502-z
04 August 2020
A Correction to this paper has been published: https://doi.org/10.1038/s41929-020-00502-z
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Acknowledgements
We thank the National Natural Science Foundation of China (nos 21790332, 21532003 and 9195600) and the ‘111’ project (B06005) of the Ministry of Education of China for financial support. We thank H. Song of the State Key Laboratory of Elemento-Organic Chemistry for the measurement and analysis of the single-crystal structure of (R)-Cat1.
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Q.-L.Z. conceived this work; F.-H.Z., J.-H.X. and Q.-L.Z. designed the experiments and analysed the data; F.-H.Z., F.-J.Z. and M.-L.L. conducted the experiments; F.-H.Z. and Q.-L.Z. wrote the manuscript.
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Supplementary Information
Supplementary Methods, Figs. 1 and 2, Tables 1–4 and references.
Supplementary Data 1
The Cartesian coordinates (Å) for the transition state in DFT calculations.
Supplementary Data 2
Crystallographic data for Cat1.
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Zhang, FH., Zhang, FJ., Li, ML. et al. Enantioselective hydrogenation of dialkyl ketones. Nat Catal 3, 621–627 (2020). https://doi.org/10.1038/s41929-020-0474-5
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DOI: https://doi.org/10.1038/s41929-020-0474-5
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