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Acta Crystallogr Sect E Struct Rep Online. 2012 Apr 1;68(Pt 4):o1147-8. doi: 10.1107/S1600536812011816. Epub 2012 Mar 24.

(1S,2R,3R,6R,7S,8R,10S,11S)-13-{[4-(4-Chloro-phen-yl)piperazin-1-yl]meth-yl}-10-hy-droxy-4,9-dimethyl-3,8,15-trioxatetra-cyclo-[10.3.0.0(2,4).0(7,9)]penta-decan-14-one.

Abstract

The title compound, C(25)H(33)ClN(2)O(5), was synthesized from 9α-hy-droxy-parthenolide (9α-hy-droxy-4,8-dimethyl-12-methyl-ene-3,14-dioxatricyclo-[9.3.0.0(2,4)]tetra-dec-7-en-13-one), which was isolated from the chloro-form extract of the aerial parts of Anvillea radiata. The mol-ecule is built up from fused five- and ten-membered rings with two additional ep-oxy ring systems and a chloro-phenyl-piperazine group as a substituent. The ten-membered ring adopts an approximate chair-chair conformation, while the piperazine ring displays a chair conformation and the five-membered ring shows an envelope conformation with the C atom closest to the hy-droxy group forming the flap. The mol-ecular conformation is stabilized by an intra-molecular O-H⋯N hydrogen bond between the hy-droxy group and a piperazine N atom. The crystal structure is stabilized by weak C-H⋯O inter-actions.

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