Among the frontier challenges in chemistry in the twenty-first century are the interconnected goals of increasing synthetic efficiency and diversity in the construction of complex molecules. Oxidation reactions of C–H bonds, particularly when applied at late stages of complex molecule syntheses, hold special promise for achieving both these goals. Here we report a late-stage C–H oxidation strategy in the total synthesis of 6-deoxyerythronolide B (6-dEB), the aglycone precursor to the erythromycin antibiotics. An advanced intermediate is cyclized to give the 14-membered macrocyclic core of 6-dEB using a late-stage (step 19 of 22) C–H oxidative macrolactonization reaction that proceeds with high regio-, chemo- and diastereoselectivity (>40:1). A chelate-controlled model for macrolactonization predicted the stereochemical outcome of C–O bond formation and guided the discovery of conditions for synthesizing the first diastereomeric 13-epi-6-dEB precursor. Overall, this C–H oxidation strategy affords a highly efficient and stereochemically versatile synthesis of the erythromycin core.
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Financial support was provided by the National Institutes of Health/National Institute of General Medicine (grant no. GM076153), Eli Lilly, Bristol-Myers Squibb, Pfizer and Amgen. E.M.S. is the recipient of a R. C. Fuson graduate fellowship, Pfizer graduate fellowship and the Roche Excellence in Chemistry Award. We thank Professor Jerome Baudry for assisting with the molecular modelling studies, D. J. Covell for his insight into π-allyl-Pd fluoride complexes and I. Patterson and P. B. Dervan for discussions.
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Stang, E., Christina White, M. Total synthesis and study of 6-deoxyerythronolide B by late-stage C–H oxidation. Nature Chem 1, 547–551 (2009). https://doi.org/10.1038/nchem.351
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