3,20-Bis(ethylenedioxy)-11-tosyloxy-9,11-seco-C-nor-5α-pregnane-9β-ol (2) on heating in dimethylformamide was converted into 17α-acetyl-11-oxa-C-nor-D-homo-5α-androstan-3-one (3).
T. Iwadare, H. Nagano and M. Shiota, J. Chem. Soc., Chem. Commun., 1985, 705 DOI: 10.1039/C39850000705
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