Chen J, Zha X. 4'-Bromo-butyl ent-16-oxobeyeran-19-oate.
Acta Crystallogr Sect E Struct Rep Online 2010;
66:o607. [PMID:
21580366 PMCID:
PMC2983525 DOI:
10.1107/s1600536810005167]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2010] [Accepted: 02/09/2010] [Indexed: 11/11/2022]
Abstract
The title compound, C(24)H(37)BrO(3), is a tetra-cyclic diterpenoid with a beyerane skeleton, synthesized by esterification of isosteviol. It comprises a fused four-ring system A/B/C/D. Rings A and B have a chair conformation, whereas ring C is an unsymmetrical distorted chair; the remaining five-membered ring D adopts an envelope conformation. The stereochemistry of the A/B and B/C ring junctions are trans, while the C/D junction is cis.
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