1β-Hydroxyvitamin D3 and 1β,25-dihydroxy-vitamin D3 have been prepared from the corresponding 1α-epimers by a convenient three-step process involving the 1-oxoprevitamin forms as the key intermediates.
H. E. Paaren, H. K. Schones and H. F. DeLuca, J. Chem. Soc., Chem. Commun., 1977, 890 DOI: 10.1039/C39770000890
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