Abstract
The relative configuration of the epoxide functionality in pinofuranoxin A (1), α-alkylidene-β-hydroxy-γ-methyl-γ-butyrolactone with trans-epoxy side chain isolated by Evidente et al. in 2021, was revised by DFT-based spectral reinvestigations and stereo-controlled synthesis. The present investigation demonstrates the difficulty of the configurational elucidation of the stereogenic centers on the conformationally flexible acyclic side-chains. Sharpless’s enantioselective epoxidations and dihydroxylations were quite effective in the reinvestigations of the configurations. As our syntheses made all diastereomers available, these would be quite effective in the next structure-biological activity relationship studies.
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Conceived and designed the experiments: Satoru Tamura, Tomikazu Kawano, and Masayoshi Arai. Performed the experiments: Kazuki Ujiie, Chiaki Tanaka, and Yuki Yoshida. Analyzed DFT calculation with DP4 method and ECD calculation: Masaru Hashimoto.
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Ujiie, K., Tanaka, C., Arai, M. et al. Proposal for structure revision of pinofuranoxin A through total syntheses of stereoisomers. J Nat Med (2024). https://doi.org/10.1007/s11418-024-01810-5
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DOI: https://doi.org/10.1007/s11418-024-01810-5