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The reaction of N,N-diethyl-3-oxo-4-methyl-4-aza-5-androstane-17β-carboxamide(1) with N-fluorodibenzenesulfonimide(NFA) and lithium diisopropylamide(LDA) was studied.Under absolute anhydrous and anaerobic conditions,the formation of 5(2α-fluoro-4-methyl-3