Photo-oxidation of cyclic enol ether (3) and successive treatments with trimethylsilyl trifluoromethanesuiphonate (TfOTMS) afforded three compounds, deoxoginghaosu (4), (5), and (6); oxidation of (4) with RuO4 gave qinghaosu (1).
B. Ye and Y. Wu, J. Chem. Soc., Chem. Commun., 1990, 726 DOI: 10.1039/C39900000726
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