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D-ring-fused dioxaphosphorinanes (4–6) in the estrone series were synthetized as epimeric pairs and investigated by NMR and computational methods in order to determine their stereostructures and predominant conformations. The study was performed to evaluate the influence of the rigid sterane framework on the geometry of the condensed hetero ring, with regard to the possible steric effect of the angular...
16β-Aminomethyl-17β-hydroxyestrone 3-methyl ether 6 and its N-propyl (17), N-benzyl (18) and N-arylmethyl derivatives (19–22) were subjected to ring closure reactions with phenylphosphonic dichloride in order to synthetize P-epimeric oxazaphosphorinanes 23a, 24–29 in which the hetero ring is condensed to ring D of the sterane skeleton. The stereostructures of the products were evaluated by 1 ...
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