Crystal and molecular structures and absolute configuration of triptolide and tripdiolide, two anti-leukaemic diterpenoid triepoxides
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 6,p. 816-819
- https://doi.org/10.1039/p29730000816
Abstract
The crystal and molecular structures and absolute configuration of the title compounds, have been determined by three-dimensional, single-crystal, X-ray analysis. Crystals of triptolide (Ia) are monoclinic, space group P21, with a= 13·420(1), b= 6·256(1), c= 11·593(1)Å, β= 118·09(1)°, and Z= 2. Crystals of tripdiolide (Ib) have the same space group, a= 13·680(2), b= 6·253(1), c= 11·684(1)Å, β= 119·05(1)°, and Z= 2. The structure of (Ia) was determined by direct methods and refined to R 0·086, by least-squares methods, for 1044 independent reflections measured by counter diffractometry. The structure of (Ib) was found by direct application of the phase angles for (Ia), and refined by least-squares to R 0·082 for 1399 independent reflections. Each molecule has an 18(4 → 3)abeo-abietane skeleton, and tripdiolide is 2-hydroxytriptolide.Keywords
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