The functionalisation of the 5β-methyl group in the 3β-hydroxy-derivatives of the title compounds is achieved by their reaction with lead tetra-acetate or by photolysis of their nitrite esters. The yields are higher than those previously reported for the related 5-methyl-19-nor-Δ9-compounds.
J. G. Ll. Jones and B. A. Marples, J. Chem. Soc., Perkin Trans. 1, 1973, 1143 DOI: 10.1039/P19730001143
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