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The novel 10β-(1 -azirinyl)estr-4-en-3,17-dione (10) has been synthesized from 19-methyl-19-methiodide salt intermediates 15 and 16 by a modified Neber reaction. Four other hitherto undescribed 10β-1 -azirinyl steroids9, 12, 17, and 18 were also synthesized. Compound 10 inhibited human placental aromatase in vitro (IC 50 value = 5.5 μM) but was not as potent as the related (19R)-10β-aziridine...
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