The first total synthesis of optically active fucoxanthin 1 and halocynthiaxanthin 2 had been accomplished via the 8-oxo compound 5, efficiently prepared by rearrangement of the α-acetylenic alcohol 10 using oxo-metallic catalyst and subsequent iodine-catalysed double-bond shift.
Y. Yamano, C. Tode and M. Ito, J. Chem. Soc., Perkin Trans. 1, 1995, 1895 DOI: 10.1039/P19950001895
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