Traditional approaches to stereoselective synthesis require high levels of enantio- and diastereocontrol in every step that forms a new stereocenter. Here, we report an alternative approach, in which the stereochemistry of organic substrates is selectively edited without further structural modification, a strategy with the potential to allow new classes of late-stage stereochemical manipulation and provide access to rare or valuable stereochemical configurations. In this work, we describe a selective epimerization of cyclic diols enabled by hydrogen atom transfer photocatalysis and boronic acid mediated transient thermodynamic control, selectively generating less stable products from the otherwise favored isomers. A range of substitution patterns and ring sizes are amenable to selective isomerization, including stereochemically complex polyols such as estriol, as well as to epimerization of acyclic vicinal diols. Moreover, this strategy has enabled the divergent epimerization of saccharide anomers, providing access to distinct sugar isomers from α- or β-configured glycosides.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9676085PMC
http://dx.doi.org/10.1021/jacs.1c11552DOI Listing

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