Results 151 to 160 of about 1,077 (172)
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Single solution phase conformation of new antiproliferative cembranes
Tetrahedron, 1999Two new cembranes (2 and 3) have been isolated from thr extract of the Antarctic sponge Lissodendoryx flabellata. Their structural elucidation has been performed by spectroscopic techniques, whereas the absolute configuration of the secondary carbinolic center was inferred by Mosher's method. The absolute stereochemistry of the second asymmetric carbon,
Angelo Fontana +3 more
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New Cembranes from the Soft Coral Sarcophyton Species
Journal of Natural Products, 1999Three new cembranes, including one with a 13-membered carbocyclic ring, have been isolated from the soft coral Sarcophyton sp.
, Iwagawa +6 more
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[Cembrane diterpenes in olibanum].
Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica, 2010To study the constituents in the chloroform extract of olibanum and their antitumor activities.The compounds were isolated by chromatographic methods and their structures were identified on the basis of spectroscopic methods and X-ray diffraction. The antiproliferative effect of the compounds in human leukemia HL-60 cells was tested by viable cell ...
Feng, Wang +3 more
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Naturally Occurring Cembranes from an Australian Sarcophyton Species
Journal of Natural Products, 2002Naturally occurring cembranes 1-4 have been isolated from a Sarcophyton sp. These compounds have not previously been found to occur in nature but had been obtained as intermediates in a synthetic modification from tobacco. The absolute stereochemistries of 3 and 4 were determined.
Pham, NB, Butler, MS, Quinn, RJ
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Cembrane Derivatives from Sarcophytum Glaucum
1977In two previous publications1,2 we described the isolation and structure elucidation of several new cembrane derivatives isolated from the soft coral Sarcophytum lglaucum. The most prominent diterpene, sarcophine (1), which crystallizes from the crude petrol-ether extract and is believed to be one of the fish repellents which protect the coral against ...
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Sinuladiterpenes A–F, New Cembrane Diterpenes from Sinularia flexibilis
Chemistry & Biodiversity, 2009AbstractChromatographic investigation of the octocoral Sinularia flexibilis afforded six new cembrane diterpenes, sinuladiterpenes A–F (1–6, resp.), in addition to four known cembranolides, 11‐episinulariolide acetate, 11‐dehydrosinulariolide, 11‐episinulariolide, and sinulariolide. Their structures were elucidated by spectroscopic analysis, especially
Kuang-Liang, Lo +3 more
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Intermediates in the Synthesis of Cembrane Diterpenes. I
Acta Crystallographica Section C Crystal Structure Communications, 1997The molecular structure of rac-(1R,2R,3S,7S)-3-hydroxy-5-isopropyl-2-methyltricyclo[8.4.0.0 2,7 ]tetradeca-4,9-dien-6-one, C 18 H 26 O 2 , has an all-cis ring-fusion tricyclic structure, with an overall distorted hemispherical conformation (the hydroxyl group is opposite the other substituents).
I. Caracelli +6 more
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Investment in SiC membrane plant follows Cembrane joining Ovivo
Membrane Technology, 2022Ovivo Inc, a provider of water and wastewater treatment equipment, technology and systems, is investing more than U$25 million in the construction of a plant in Texas, USA, to manufacture Cembrane silicon carbide (SiC) membranes.
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Cembrane, synthesis. An advanced intermediate for crassin acetate.
Tetrahedron Letters, 1991Abstract The intramolecular alkyLation of a lithioalkyne with an allylic bromide produced the fourteen membered ring of crassin acetate. A nitrile oxide cycloaddition furnished the lactone and stereocenters at C1 and C14.
Marcus A. Tius, N. Kesavulu Reddy
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The First Cembrane−Pseudopterane Cycloisomerization
The Journal of Organic Chemistry, 1998Abimael D., Rodríguez, Jian-Gong, Shi
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