Results 151 to 160 of about 10,911 (198)

Cytotoxic clerodane diterpenes fromPolyalthia barnesii

Phytochemistry, 1994
Three cytotoxic clerodane diterpenes were purified from an ethyl acetate-soluble extract of the stem bark of Polyalthia barnesii, namely, 16 alpha-hydroxycleroda-3,13(14)Z-dien-15,16-olide, a known compound, and two novel compounds, 3 beta, 16 alpha-dihydroxycleroda-4(18),13(14)Z-dien-15,16-olide and 4 beta, 16 alpha-dihydroxyclerod-13(14)Z-en-15,16 ...
X, Ma, I S, Lee, H B, Chai, K, Zaw, N R, Farnsworth, D D, Soejarto, G A, Cordell, J M, Pezzuto, A D, Kinghorn   +8 more
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Clerodane Diterpenes from Tinospora rumphii

Journal of Natural Products, 2000
Two new diterpenes (1 and 2) were obtained from the leaves of Tinospora rumphii, along with the known compounds tinotufolin D and vitexilactone. The structures of compounds 1 and 2 were established on the basis of spectroscopic studies.
C Y, Ragasa, M C, Cruz, R, Gula, J A, Rideout   +3 more
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Neo-clerodane diterpenes from Teucrium fruticans

Phytochemistry, 2004
In addition to three out of the four previously reported neo-clerodanes already found in Teucrium fruticans (fruticolone, isofruticolone and 8 beta-hydroxyfruticolone), and 6-acetylteucjaponin B (isolated from T. scordium and T. grisebachii), four new neo-clerodanes, namely 7 beta-hydroxyfruticolone, 11-hydroxyfruticolone, deacetylfruticolone and 6 ...
Coll Toledano, Josep, Tandrón, Yudelsy A.   +1 more
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Ajugatansins,neo-clerodane diterpenes fromAjuga reptans

Phytochemical Analysis, 2001
New neo-clerodane diterpenes have been isolated from Ajuga reptans, and named ajugatansins, along with the previously reported ajugavensin A and ajugareptansone A. The structures of all the compounds were elucidated by spectroscopic means and comparison with closely related compounds reported in the literature.
P, Carbonell, J, Coll
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Diterpene Analysis with Emphasis on Clerodanes

1990
Early work on Compositae diterpenes focused on Solidago and the normal-labdane, solidagenone (Figure 33 [pp. 513–514]; Structure 158) (9, 16, 17). Later, ent-clerodanes (kolavanes) were found to co-occur with the labdanes (364, 365). The first identified novel clerodane, solidagonic acid (Figure 33; Structure 500), was shown by chemical interconversion
Fred Seaman, Ferdinand Bohlmann, Christa Zdero, Tom J. Mabry   +3 more
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Clerodane Diterpenes in Labiatae

1994
The chemical constituents of the Labiatae family have been studied mainly for their economic value which is closely related to their high content of essential oils. These consist mostly of volatile mono- and sesquiterpenes. There is much less information on the diterpenoid content of these plants although the latter has been considered (1) potentially ...
L. Rodríguez-Hahn, B. Esquivel, J. Cárdenas   +2 more
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Clerodane diterpenes from Haplopappus deserticola

Phytochemistry, 1999
From the resinous exudate of Haplopappus deserticola a new clerodane diterpene named deserticolic acid (1), the known 18-acetoxy-cis-cleroda-3,13E-dien-15-oic acid (2) and four flavonoids were isolated. The structure of 1 was elucidated as 19-hydroxy-cis-cleroda-3,13E-dien-15-oic acid (ent-5α form) by spectroscopic methods.
E Tojo, M.E Rial, A Urzua, L Mendoza
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Aneo-clerodane diterpene fromClerodendron inerme

Phytochemistry, 1992
Abstract The structure of a new diterpene isolated from the leaves of Clerodendron inerme was established by spectroscopic methods as 15-methoxy-14,15-dihydro-3-epicaryoptin.
Basudeb Achari, Chandana Giri, Chitta R. Saha, Pradeep K. Dutta, Satyesh C. Pakrashi   +4 more
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A clerodane diterpene from Scutellaria altissima

Phytochemistry, 1996
A mixture of the C-15 epimers of the 15-hydroxy derivative of scutecolumnin C has been isolated from the aerial parts of Scutellaria altissima. The structures of the epimers were established by chemical and spectroscopic means.
Peter Y. Malakov, Georgi Y. Papanov, Iva M. Boneva   +2 more
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Constituents of Burasaïa madagascarensis: A New Clerodane-Type Diterpene

Planta Medica, 2002
From an ethanol extract of the stems of Burasaïa madagascarensis Thouars (Menispermaceae) were isolated N-acetylnornuciferine and two clerodane-type diterpenes, one of them, epicordatine, being new. The structures were established by the interpretation of the spectral data. All the described compounds exhibited weak antimalarial activity.
Mambu, L., Ramanandraibe, V., Martin, M.T., Blond, A., Grellier, P., Frappier, F.   +5 more
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