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16?,17?-Ep-oxy-5?-hydr-oxy-6?-nitrooxy-20-oxopregnan-3?-yl acetate.

ABSTRACT: The title steroid, C(23)H(33)NO(8), is a pregnane derivative obtained regio-, stereo- and chemoselectively from the ring opening of the corresponding 5?,6?;16?,17?-diepoxide with bis-muth(III) nitrate. There are two symmetry-independent mol-ecules in the asymmetric unit that show no significant differences concerning bond lengths and angles. All rings are trans-fused. The conformations of the six-membered rings are close to chair forms, while the five-membered ring adopts an envelope conformation. The mol-ecules are held together by an extensive O-H?O hydrogen-bonding network of chains runnning along the a axis.

SUBMITTER: Pinto RM 

PROVIDER: S-EPMC2969566 | biostudies-literature | 2009 May

REPOSITORIES: biostudies-literature

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16α,17α-Ep-oxy-5α-hydr-oxy-6β-nitrooxy-20-oxopregnan-3β-yl acetate.

Pinto R M A RM   Matos Beja A A   Salvador J A R JA   Paixão J A JA  

Acta crystallographica. Section E, Structure reports online 20090514 Pt 6

The title steroid, C(23)H(33)NO(8), is a pregnane derivative obtained regio-, stereo- and chemoselectively from the ring opening of the corresponding 5α,6α;16α,17α-diepoxide with bis-muth(III) nitrate. There are two symmetry-independent mol-ecules in the asymmetric unit that show no significant differences concerning bond lengths and angles. All rings are trans-fused. The conformations of the six-membered rings are close to chair forms, while the five-membered ring adopts an envelope conformatio  ...[more]

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