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Acta Cryst. (2013). E69, o1709-o1710
[ doi:10.1107/S1600536813028730 ]


N. R. Penthala, V. Janganati, S. Parkin, K. I. Varughese and P. A. Crooks

Abstract: The title compound, C21H25NO3 [systematic name: (3aS,9aR,10aR,10bS,E)-3-[(E)-4-(4-amino­benzyl­idene)-6,9a-dimethyl-3a,4,5,8,9,9a,10a,10b-octa­hydro­oxireno[2',3':9,10]cyclo­deca­[1,2-b]furan-2(3H)-one] was obtained from the reaction of parthenolide [synonym: 4,5-ep­oxy­germacra-1(10),11(13)-dieno-12,6-lactone] with 4-iodo­aniline under Heck reaction conditions. It was identified as the E-isomer (conformation about the exocyclic methyl­idene C=C bond; the conformation about the C=C bond in the ten-membered ring is also E). The mol­ecule is built up from fused ten-, five- (lactone) and three-membered (epoxide) rings with a 4-amino­phenyl group as a substituent. The ten-membered ring displays an approximate chair-chair conformation, while the lactone ring has an envelope conformation with the C atom bonded to the ring O atom as the flap. The dihedral angle between the benzene ring of the 4-amino­phenyl moiety and the lactone ring mean plane is 23.50 (8)°. In the crystal, mol­ecules are linked via N-H...O hydrogen bonds, between the amine group and the lactone and epoxide ring O atoms, forming chains propagating along the b-axis direction. Adjacent chains are linked via C-H...O inter­actions, forming an undulating two-dimensional network lying parallel to the plane (001). The absolute structure of the mol­ecule in the crystal was confirmed by resonance scattering [Flack parameter = 0.03 (3)].

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