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José Castañeda-Acosta Howard G. Pentes Frank R. Fronczek Nikolaus H. Fischer 《Journal of chemical crystallography》1999,29(9):1057-1059
The sesquiterpene lactone isoconfertiflorin, C17H22O5, 1, crystallizes in trigonal space group P31 with a = 10.4498(5), c = 12.7516(8) Å, V = 1205.9(2) Å3, and Z = 3. It differs from confertiflorin in having an endocyclic C=C bond in the lactone ring, which carries an exocyclic methyl group. The seven-membered ring adopts an approximate twist-chair conformation with C10 lying in the local two-fold axis, and asymmetry parameter C2 = 5.8°. The cyclopentanone ring has the half-chair conformation with C4 on the local two-fold axis, and C2 = 0.9°. The lactone ring is almost planar with maximum deviation 0.014(2) Å. Both methyl groups on the 7-membered ring are –oriented. The acetyl group at C8 has an orientation. 相似文献
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Amarpreet Kaur Shalinder Kaur Rupali Jandrotia Harminder Pal Singh Daizy Rani Batish Ravinder Kumar Kohli Virendra Singh Rana Najam A. Shakil 《Molecules (Basel, Switzerland)》2021,26(17)
Parthenin, a sesquiterpene lactone of pseudoguaianolide type, is the representative secondary metabolite of the tropical weed Parthenium hysterophorus (Asteraceae). It accounts for a multitude of biological activities, including toxicity, allergenicity, allelopathy, and pharmacological aspects of the plant. Thus far, parthenin and its derivatives have been tested for chemotherapeutic abilities, medicinal properties, and herbicidal/pesticidal activities. However, due to the lack of toxicity–bioactivity relationship studies, the versatile properties of parthenin are relatively less utilised. The possibility of exploiting parthenin in different scientific fields (e.g., chemistry, medicine, and agriculture) makes it a subject of analytical discussion. The present review highlights the multifaceted uses of parthenin, on-going research, constraints in the practical applicability, and the possible workarounds for its successful utilisation. The main aim of this comprehensive discussion is to bring parthenin to the attention of researchers, pharmacologists, natural product chemists, and chemical biologists and to open the door for its multidimensional applications. 相似文献
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