Abstract
Two alkaloid triterpenoids formulated as C26H35NO3 (1) and C30H45NO2 (2) were isolated from the timer tree Aphanamixis grandifolia. The structure of 1 and 2 was determined by IR, HRESIMS, 1D, and 2D-NMR. Compound 1 was confirmed by X-ray single crystal diffraction. Compound 1 crystallizes in the monoclinic, space group C2 with unit cell parameters a = 53.195(4) Å, b = 7.6339(8) Å, c = 11.202(2) Å, β = 94.6520(2)°. Intermolecular hydrogen bonding and π–π stacking were presented in the molecular packing of 1. The absolute configurations of 1 and 2 were established by comparison of experimental circular dichroism properties with their electronic circular dichroism predicted by molecular modeling DFT calculations.
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The research work was partially supported by National Key Scientific and Technological Special Project (Grant No. 2009ZX09502-011).
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Wang, XB., Zhang, Y., Wang, JS. et al. Spectroscopic characterizations, X-ray studies, and electronic circular dichroism calculations of two alkaloid triterpenoids. Struct Chem 22, 1241–1248 (2011). https://doi.org/10.1007/s11224-011-9818-8
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DOI: https://doi.org/10.1007/s11224-011-9818-8