An approach to 1α, 25-dihydroxyvitamin D3 involving the preparation of the vinyl selenide 8, its cyclization to 9 with tributyltin hydride and the conversion of the latter into the known isomeric dienes 3 and 10 is described.
D. Batty and D. Crich, J. Chem. Soc., Perkin Trans. 1, 1991, 2894 DOI: 10.1039/P19910002894
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