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ABSTRACT:
SUBMITTER: Rincon S
PROVIDER: S-EPMC3588813 | biostudies-other | 2012 Dec
REPOSITORIES: biostudies-other
Acta crystallographica. Section E, Structure reports online 20121103 Pt 12
The crystal structure of the title compound, C31H45BrO5·CH2Cl2, prepared in six steps from diosgenin, confirmed that the configurations of the stereogenic centers, positions 20S and 25R, remain unchanged during the reaction. The six-membered A, B and C rings have chair conformations. The five-membered ring D has an envelope conformation (with the methyl-substituted C atom fused to ring C as the flap) and the six-membered dihydro-pyran ring E adopts a twist-boat conformation. In the crystal, mol- ...[more]