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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 ...
New types of P-heterocyclic-fused steroids, such as dioxa- and oxazaphosphorinane derivatives, were synthetized from estrone-1,3-dihydroxy and 1,3-aminoalcohol precursors by cyclization with phenylphosphonic dichloride.
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