Metallaphotoredox-enabled deoxygenative arylation of alcohols

Zhe Dong and David W. C. MacMillan ()
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Zhe Dong: Merck Center for Catalysis at Princeton University
David W. C. MacMillan: Merck Center for Catalysis at Princeton University

Nature, 2021, vol. 598, issue 7881, 451-456

Abstract: Abstract Metal-catalysed cross-couplings are a mainstay of organic synthesis and are widely used for the formation of C–C bonds, particularly in the production of unsaturated scaffolds1. However, alkyl cross-couplings using native sp3-hybridized functional groups such as alcohols remain relatively underdeveloped2. In particular, a robust and general method for the direct deoxygenative coupling of alcohols would have major implications for the field of organic synthesis. A general method for the direct deoxygenative cross-coupling of free alcohols must overcome several challenges, most notably the in situ cleavage of strong C–O bonds3, but would allow access to the vast collection of commercially available, structurally diverse alcohols as coupling partners4. We report herein a metallaphotoredox-based cross-coupling platform in which free alcohols are activated in situ by N-heterocyclic carbene salts for carbon–carbon bond formation with aryl halide coupling partners. This method is mild, robust, selective and most importantly, capable of accommodating a wide range of primary, secondary and tertiary alcohols as well as pharmaceutically relevant aryl and heteroaryl bromides and chlorides. The power of the transformation has been demonstrated in a number of complex settings, including the late-stage functionalization of Taxol and a modular synthesis of Januvia, an antidiabetic medication. This technology represents a general strategy for the merger of in situ alcohol activation with transition metal catalysis.

Date: 2021
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DOI: 10.1038/s41586-021-03920-6

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