共查询到20条相似文献,搜索用时 15 毫秒
1.
Ferdinand Bohlmann Jasmin Jakupovic Mohyeddin Hashemi-Nejad Siegfried Huneck 《Phytochemistry》1985,24(3):608-610
The aerial parts of Aster alpinus afforded, in addition to dammadienyl acetate and dammadienone, two clerodane derivatives related to salviarin and bacchotricuneatin A. The structures were elucidated by spectroscopic methods, especially high-field NMR. The chemotaxonomic situation is discussed briefly. 相似文献
2.
Ferdinand Bohlmann Christa Zdero Michael Grenz Autar K. Dhar Harold Robinson Robert M. King 《Phytochemistry》1981,20(2):281-286
The investigation of nine Baccharis species afforded, in addition to known compounds, three new clerodane derivatives related to bacchotricuneatin B, two ent-labdane derivatives, two 3-acetoxyflavanones, a benzofuran derivative and a chromene. The overall picture of the chemistry of this large genus is still not very clear. 相似文献
3.
Ferdinand Bohlmann Wolfgang Kramp Jasmin Jakupovic Harold Robinson Robert M. King 《Phytochemistry》1982,21(2):399-403
The aerial parts of Baccharis minutiflora afforded in addition to known compounds eight new ent-kaurane derivatives, one being a homo kaurane, while the aerial parts of B. alatemoides gave two pairs of epimeric clerodane derivatives, which, however, had to be modified chemically before they could be separated. The stereochemistry of these diterpenes could not be elucidated with certainty. 相似文献
4.
A new neo-clerodane diterpenoid was isolated from the aerial parts of Baccharis incarum together with the previously known diterpenoids bacchalineol and barticulidiol. 相似文献
5.
Ferdinand Bohlmann Wolf-Rainer Abraham Robert M. King Harold Robinson 《Phytochemistry》1981,20(8):1903-1906
The investigation of two Koanophyllon species afforded, in addition to known compounds, several new diterpenes, two new geranylgeraniol derivatives and four diterpenes, most probably closely related to clerodanes; their structures, however, could not be deduced with certainty. The chemotaxonomic situation of this genus is discussed briefly. 相似文献
6.
Mambu L Grellier P Florent L Joyeau R Ramanitrahasimbola D Rasoanaivo P Frappier F 《Phytochemistry》2006,67(5):444-451
Seven diterpenoids including four clerodane and three labdane derivatives, (13S)-ent-7beta-hydroxy-3-cleroden-15-oic acid (1), ent-7beta-hydroxy-2-oxo-3-cleroden-15-oic acid (2), ent-2,7-dioxo-3-clero-den-15-oic acid (3), ent-18-(E)-caffeoyloxy-7beta-hydroxy-3-cleroden-15-oic acid (4) (13S)-ent-18-(E)-coumaroyloxy-8(17)-labden-15-oic acid (5), ent-18-(E)-caffeoyloxy-8(17)-labden-15-oic acid (6), ent-15-(E)-caffeoyloxy-8(17)-labden-18-oic acid (7), have been isolated from an ethyl acetate extract of the leaves of Nuxia sphaerocephala, together with 17 known compounds. 3-Oxolup-20(29)-en-30-al (3-oxolupenal) (8) and 3beta-hydroxylup-20(29)-en-30-al (3beta-hydroxy-lupenal) (9) showed the best inhibitory activity against Plasmodium falciparum with the IC(50) values between 1.55 and 4.67 microg/ml in vitro, respectively. The structure and the relative stereochemistry of the compounds were established on the basis of their spectroscopic properties. The absolute configuration at C-13 of 1 and 5 was determined by the PGME amide procedure. 相似文献
7.
Ferdinand Bohlmann Jasmin Jakupovic Maniruddin Ahmed Michael Wallmeyer Harold Robinsont Robert M. King 《Phytochemistry》1981,20(10):2383-2387
The investigation of three Hemizonia species afforded in addition to known compounds seven new labdane derivatives, all derived from labd-13-en-15-ol. The absolute configuration of these diterpenes was determined by degradation of the triol by periodate cleavage, which afforded a known norditerpene ketone. From H. fitchii two new chromene esters and the cis-isomer of a known coumarate were isolated. H. congesta afforded in addition to labdane derivatives a hydroxycubebol. 相似文献
8.
9.
Two new labdanoids from Nicotiana raimondii have been identified as (12E) - 7β - hydroxylabda - 8(20),12,14 - triene and 7β - hydroxy - labda - 8(20),13(16),14 - triene. 相似文献
10.
Ferdinand Bohlmann Jasmin Jakupovic Robert M. King Harold Robinson 《Phytochemistry》1982,21(5):1103-1107
The aerial parts of Madia sativa afforded, in addition to known compounds, two labdane derivatives whose structures were elucidated by spectroscopic methods. The absolute configuration was determined by chemical transformations. From the roots a new tremetone derivative was isolated. The constituents indicated close relationships of Madia to Hemizonia. 相似文献
11.
Ferdinand Bohlmann Cornelius Scheidges Robert M. King Harold Robinson 《Phytochemistry》1984,23(5):1190-1192
A re-investigation of the aerial parts of Koanophyllon conglobatum afforded six new diterpenes, five labdanes and one seco-labdane, as well as two hydroperoxides which may be artefacts. 相似文献
12.
Aurelio San Martín Juana Rovirosa Rodolfo Becker Mariano Castillo 《Phytochemistry》1980,19(9):1985-1987
Erythroxylol-A, oleanolic acid, erythroxylol-A oxide, scopolatine, 4-hydroxy-3-methoxyacetophenone and two new diterpenes, ent-beyer-14-en-18-ol and 19-hydroxy-13-epimanoyl oxide, were isolated from B. tola. 相似文献
13.
Ferdinand Bohlmann Cornelius Scheidges Christa Zdero Robert M. King Harold Robinson 《Phytochemistry》1984,23(5):1109-1111
The aerial parts of Baccharis sternbergiana afforded six new ent-labdane derivatives, while those of a Baccharis tricuneata subspecies gave 12-acetoxytremetone. 相似文献
14.
Das B Ravinder Reddy M Ramu R Ravindranath N Harish H Ramakrishna KV Koteswar Rao Y Harakishore K Murthy US 《Phytochemistry》2005,66(6):633-638
Five clerodane diterpenoids have been isolated from the aerial parts of Pulicaria wightiana along with 3'5,6-trihydroxy-3,4',7-trimethoxyflavone and 2-methyl-5-hydroxy-chroman-4-one. The structures and stereochemistry of the compounds were established from spectral (mainly 1D and 2D NMR) studies. The last two compounds were not reported earlier from this plant. The antibacterial activity of the diterpenoids were studied. 相似文献
15.
Ferdinand Bohlmann Christa Zdero Robert M. King Harold Robinson 《Phytochemistry》1984,23(9):2007-2012
The aerial parts of Gutierrezia sarothrae afforded in addition to polyalthic acid, daniellic acid and nivenolide, 14 new diterpenes, most of them closely related to polyalthic acid. One of these compounds has a new carbon skeleton. The structures were elucidated by spectroscopic methods and by some chemical transformations. 相似文献
16.
Ferdinand Bohlmann Christa Zdero Rajinder Kumar Gupta Robert M. King Harold Robinson 《Phytochemistry》1980,19(12):2695-2705
The investigation of four Acritopappus species afforded twenty-three new diterpenes of the labdane or kolavane type and three tetranorditerpenes as well as two new benzofuran derivatives and a hydroxybicyclogermacrene. The structures were elucidated by spectroscopic methods and by some chemical transformations. Though the absolute configuration were not established in all cases, most probably all diterpenes were ent-labdanes or kolavanes (clerodanes). The chemotaxonomic importance of this investigation is discussed briefly. 相似文献
17.
Laura Pérez-Sirvent Benjamín Rodríguez Giuseppe Savona Orietta Servetta 《Phytochemistry》1983,22(2):527-530
From the aerial part of Galeopsis angustifolia collected in Spain, a labdane and three rearranged labdane diterpenoids have been isolated. The structures of these new substances have been established by chemical and spectroscopic means and by correlation with known compounds. A sample of the same species collected in Italy and other species of Galeopsis showed some remarkable chemical differences. The taxonomic significance of these results is discussed briefly. 相似文献
18.
The aerial parts of Heteropappus altaicus afforded, in addition to more widespread compounds and known clerodane derivatives, three new ones and a seco-clerodane acid. Furthermore, a neryl geraniol derivative was present. The structures were elucidated by spectroscopic methods. The stereochemistry was solved by NOE difference spectroscopy and by the Horeau method. 相似文献
19.
Werner Herz Kinzo Watanabe Palaniappan Kulanthaivel John F. Blount 《Phytochemistry》1985,24(11):2645-2654
The following new cycloartanes were isolated from the aerial parts of Lindheimera texana: (16S,23S)- and (16S,23R)-16,23-epoxycycloart-24-en-3-one, (3S,16S,23S)- and (3S,16S,23R)-16,23-epoxycycloart-24-en-3ol, (16S,23R)-16,23-epoxy-23,25-epidioxycycloartan-3-one, (16S)-23,24,25,26,27-pentanorcycloartan-3-one-16,22-olide, (16S,23S,24R)- or (16S,23R,24S)-23,24-epoxycycloartan-3-one-16,25-diol and (16S,23ζ,24ζ)-cycloartan-3-one-16,23,24,25-tetrol. Structures were established by chemical transformations and spectroscopic methods and, in the case of (16S,23R)-16,23-epoxy-23,25-epidioxycycloartan-3-one, by X-ray crystallography. Norambreinolide, several known labdanes and oleanolic acid were also isolated. 相似文献
20.
A brown alga of the genus Dictyota has yielded three new dolabellane diterpenoids the structures of which were elucidated mainly by spectroscopic methods. 相似文献