The title compound has been synthesised from 9-dehydroprogesterone. Hydroxy-groups at C-9 and C-11 in a 9,11-seco-intermediate were replaced with hydrogen atoms by desulphurisation of a bisphenylthio-derivative made via the dimesylate. 9-Dehydroprogesterone can be selectively ozonised in ring C.
N. S. Crossley and R. Dowell, J. Chem. Soc. C, 1971, 2496 DOI: 10.1039/J39710002496
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