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Insights into the Synthesis of Steroidal A-Ring Olefins

one (5), from the D1-3-keto enone, (5a,17b)-3-oxo-5-androst-1-en-17-yl acetate (1), through a strategy involving the reaction of D1-3-hydroxy allylic alcohol, 3b-hydroxy-5a-androst-1-en-17b-yl acetate (2), with SOCl2 , was revisited in order to prepare and biologically evaluate 5 as aromatase inhibitor for breast cancer treatment. Surprisingly, the followed strategy also afforded the isomeric D2-olefin 6 as a b...