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1.
A series of known di- and triterpenoids were characterized in the whole plant of Wedelia buphthaimiflora. 相似文献
2.
Kozhiparambil K. Purushothaman Ayyappath Sarada Ariyamuthu Saraswathy Joseph D. Connolly 《Phytochemistry》1983,22(4):1042-1043
Sempervirenic acid, a new diterpene has been isolated from Solidago sempervirens and its structure determined by spectroscopic methods and chemical conversions to be 3β-acetoxy-labda-7,13-diene-15-oic acid. 相似文献
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4.
Ferdinand Bohlmann Maniruddin Ahmed Harold Robinson Robert M. King 《Phytochemistry》1981,20(6):1439-1440
A new kolavane derivative, 18-acetoxy-kolav-3-en-15-oic acid, has been isolated from Liatris scariosa. 相似文献
5.
The stem bark of Xylopia aethiopica has yielded four diterpenes, two of them novel. Three of the diterpenes were identified as (?)-kaur-16-en-19-oic acid and its 7-oxo and 7β-hydroxy derivatives. The fourth was the novel kolavane derivative 2-oxo-kolav-3,13-dien-15-oic acid, a type of compound not previously recorded in the Annonaceae. 相似文献
6.
Anamaría Retana Ramos Eleazar M. Escamilla José Calderón Benjamín Rodríguez 《Phytochemistry》1984,23(6):1329-1330
A new diterpenoid has been isolated from the leaves and fruits of Taxodium mucronatum. Its structure, 8β-hydroxypimar-15-en- 19-oic acid, was established by chemical and spectroscopic means. 相似文献
7.
Antonio G. González José Amaro Braulio M. Fraga Javier G. Luis José Fayos Aurea Perales Mercedes P. Méndez 《Phytochemistry》1984,23(9):2079-2080
Two new triterpenes, 3-oxo-20-hydroxy-lupan-28-oic and 3β,6β-dihydroxy-olean-18-en-28-oic acids, along with oleanonic, morolic and sumaresinolic acids have been isolated from Orthopterygium huancuy. The structure of the first new terpene was determined by single crystal X-ray analysis. 相似文献
8.
From the leaves of Enkianthus campanulatus were isolated three new triterpenes, 3-oxo-19,23,24-trihydroxyurs-12-en-28-oic acid, 3β,6β, 19,23-tetrahydroxyurs-12-en-28-oic acid and 3β,6β,23-trihydroxyurs-12-en-28-oic acid. 相似文献
9.
Paulo M. Imamura Anita J. Marsaioli Lauro E.S. Barata Edmundo A. Rúveda 《Phytochemistry》1977,16(11):1842-1844
The 13C NMR spectra of some eperuane diterpenes have been recorded and the signals assigned. The substituent shielding effects in these compounds, in comparison with those observed in other series of diterpenes, are also presented. 相似文献
10.
A novel diterpene has been isolated from the stem bark of Xylopia quintasii and identified as 7β-acetoxytrachyloban-18-oic acid. The taxonomic si 相似文献
11.
Yohei Hashimoto Hiroyuki Ishizone Midori Moriyasu Kazuko Kawanishi Atsushi Kato Masaru Ogura 《Phytochemistry》1984,23(3):693-694
Two new triterpenes from the root of Periandra dulcis were found to be 3,25-dioxoolean-12(13)-en-30-oic acid and 3,25-dioxoolean-18(19)-en-30-oic acid. 相似文献
12.
Twenty-seven mainly terpenoid constituents were identified in the essential oil of Mikania micrantha whole plant. Higher terpenoids present in the same plant included two kaurene derivatives and taraxasterol. 相似文献
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María C. García-Alvarez Mariapia Paternostro Franco Piozzi Benjamín Rodríguez Giuseppe Savona 《Phytochemistry》1979,18(11):1835-1837
From the aerial parts of Cleonia lusitanica four previously known diterpenoids have been isolated. In addition, a new isopimarane derivative, cleonioic acid, has been obtained and the structure 11α-acetoxy-7,15-iso-pimaradien-18-oic acid established by chemical and spectroscopic means and by correlation with 7,15-isopimaradien-18-ol. 相似文献
15.
Acid hydrolysis of the saponins from the stem bark of Guaiacum officinale yielded the new sapogenin 3β,20η-dihydroxy-30-norolean-12-en-28-oic acid and the artifacts 3β-hydroxy-30-norolean-12,19-dien-28-oic acid and its methyl ester. Larreagenin, sitosterol and oleanolic acid were also isolated. 相似文献
16.
Four labdane-type diterpenoids have been isolated from the seed of Platycladus orientalis. Their structures have been elucidated by spectroscopic and chemical methods. 相似文献
17.
Weifang Wang Takahiro Nakazawa Remy E.P. Mangindaan Henki Rotinsulu Sachiko Tsukamoto 《Steroids》2009,74(9):758-8269
(25S)-3-Oxocholesta-1,4-dien-26-oic acid (1) and a new (25S)-18-acetoxy-3-oxocholesta-1,4-dien-26-oic acid (2) were isolated from a soft coral Minabea sp. (cf. aldersladei) collected in North Sulawesi, Indonesia, together with two known cholic-acid-type compounds, 3-oxochol-1,4-dien-24-oic acid (3) and 3-oxochol-4-en-24-oic acid (4). The structures of these compounds were determined on the basis of their spectroscopic data. The absolute stereochemistry at C-25 of 2 was determined by comparative 1H NMR study using chiral anisotropic reagents [(S)- and (R)-phenylglycine methyl esters]. This is the first to report compound 1 as a natural product. 相似文献
18.
Ling-Ling Xu Ling-Yi Kong 《植物学报(英文版)》2006,48(4):478-481
in order to investigate the active substances of Coleus forskohlii(Wiiid.) Brlq., a new labdane dlterpenold, 12- hydroxy-8,13E-labdadlen-15.olc acid, together with two 8,13-epoxylabd-14-ene-11-one dlterpenolds, 6-acetyl-1- deoxyforskolln and 6-acetyl-1,9-dldeoxyforskolln, was Isolated on the basis of various chromatographic technlques and spectroscopic methods. 相似文献
19.
Sebiferenic acid, isolated from the bark of Sapium sebiferum, has been characterized as 2α,3β-dihydroxytaraxer-14-en-28-oic acid on the basis of 1H NMR, 13C NMR and mass spectral evidence and chemical transformations. The structure of sebiferic acid has been revised. 相似文献
20.
The structure of terminic acid, a new dihydroxytriterpene carboxylic acid isolated from the roots of Terminalia arjuna, has been established as 3β, 13β-dihydroxylup-20(29)-en-28-oic acid by a study of its chemical reactions and spectroscopic data. Terminic acid and its derivatives were found to undergo skeletal rearrangement under protonic conditions to yield oleanene lactone. 相似文献