[structure: see text] Three novel tetranortriterpenoids, cipadesins A-C (1-3), were isolated from the aerial parts of Cipadessa cinerascens. They possess a novel carbon skeleton, in which rings A and C were joined via C-10 and C-11. Their structures were elucidated by spectral evidence. X-ray crystallographic analysis confirmed the structure of 1.
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http://dx.doi.org/10.1021/ol052021+ | DOI Listing |
J Nat Prod
June 2020
State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai, 201203, People's Republic of China.
Eighteen new limonoids, including eight methyl angolensates (-) and 10 cipadesins (-), were isolated from the leaves of . Their structures were characterized by means of spectroscopic data analyses, single-crystal X-ray diffraction, and quantum chemistry computational methods. The C-6 configurations in those compounds possessing a C-6 hydroxy group were all assigned as regardless of the magnitude of , and the C-2' configuration in those bearing a 2-methylbutyryl residue was defined by single-crystal X-ray diffraction and NMR data.
View Article and Find Full Text PDFOrg Lett
October 2005
Chengdu Institute of Biology, Chinese Academy of Sciences.
[structure: see text] Three novel tetranortriterpenoids, cipadesins A-C (1-3), were isolated from the aerial parts of Cipadessa cinerascens. They possess a novel carbon skeleton, in which rings A and C were joined via C-10 and C-11. Their structures were elucidated by spectral evidence.
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