17α-Acetoxy-2′,2′,6β-trifluoro-6β,7β-dihydro-16-methylenecyclopropa[6,7]progesterone (9) and its Δ1-analogue (10) have been synthesised by a ten-step reaction sequence from 3-hydroxy-16-methylpregna-5,16-dien-20-one (1).
H. Carpio, P. Crabbé and J. H. Fried, J. Chem. Soc., Perkin Trans. 1, 1973, 227 DOI: 10.1039/P19730000227
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