An efficient method for the preparation of a C/D-ring synthon for 20-epi-22-oxavitamin D3 analogues is developed based on Me3SiOSO2CF3 catalysed reductive etherification of a ketone with an alkoxytrimethylsilane in the presence of triethylsilane.
S. Hatakeyama, T. Ikeda, H. Irie, C. Izumi, H. Mori, K. Uenoyama, H. Yamada and M. Nishizawa, J. Chem. Soc., Chem. Commun., 1995, 1959 DOI: 10.1039/C39950001959
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