Studies of Australian Ascidians. VI. Virenamides D and E, Linear Peptides from the Colonial Didemnid Ascidian Diplosoma virens

1997 ◽  
Vol 50 (4) ◽  
pp. 337 ◽  
Author(s):  
Yunjiang Feng ◽  
Bruce F. Bowden
Keyword(s):  
Great Barrier Reef ◽  
Spectroscopic Data ◽  
Two Dimensional ◽  
Barrier Reef ◽  
Minor Constituents ◽  
One Dimensional ◽  
The Absolute ◽  
Absolute Stereochemistry

Two new linear cytotoxic tripeptides, virenamides D and E, have been isolated as minor constituents of extracts of the didemnid ascidianDiplosoma virens collected on the Great Barrier Reef, Australia. Their structures were deduced from one-dimensional and two-dimensional n.m.r. spectroscopic data, and the absolute stereochemistry of virenamide E is proven by synthesis from virenamide A.

Coscinoquinol, a New Cytotoxic Sesterterpene From a Dictyoceratid Sponge, Coscinoderma sp.

1994 ◽  
Vol 47 (1) ◽  
pp. 191 ◽  
Author(s):  
GV Alea ◽  
AR Carroll ◽  
BF Bowden
Keyword(s):  
Great Barrier Reef ◽  
Marine Sponge ◽  
Biological Activities ◽  
Two Dimensional ◽  
Barrier Reef ◽  
One Dimensional

A marine sponge, Coscinoderma sp., from the Great Barrier Reef, Australia, contained a new sesterterpene hydroquinone, coscinoquinol (1). The structure was elucidated by one-dimensional and two-dimensional n.m.r. techniques. Cytotoxicity and other biological activities are reported for (1).

New Chlorinated Metabolites from the Tropical Marine Sponge Dysidea herbacea

1997 ◽  
Vol 50 (2) ◽  
pp. 139 ◽  
Author(s):  
Eric J. Dumdei ◽  
Jamie S. Simpson ◽  
Mary J. Garson ◽  
Karl A. Byriel ◽  
Colin H. L. Kennard
Keyword(s):  
Great Barrier Reef ◽  
Marine Sponge ◽  
Crystallographic Analysis ◽  
Southern Region ◽  
Barrier Reef ◽  
X Ray ◽  
Dysidea Herbacea ◽  
Absolute Stereochemistry

Three new chlorinated metabolites, namely 3-(3,3-dichloro-2-methylpropyl)-6-(3,3-dichloro-2-methyl-propylidene)-1,4-dimethylpiperazine-2,5-dione (3), 1-methyl-3-(3,3,3-trichloro-2-methylpropyl)-6-(3,3,3-richloro-2-methylpropylidene)piperazine-2,5-dione (4) and 5,5-dichloro-4-methyl-2-[methyl(4,4-dichloro-3-methyl-1-oxobutyl)amino]-N-(thiazol-2-ylmethyl)pentanamide (8), have been isolated from collections of Dysidea herbacea from the southern region of the Great Barrier Reef. The relative and absolute stereochemistry of (4) was determined by X-ray crystallographic analysis.

Pigments of Fungi. LVI. Dermocanarin 7, a New Naphthalene - Dihydroanthracenone - Oxanthrone Trimer from an Australian Dermocybe Toadstool

1999 ◽  
Vol 52 (9) ◽  
pp. 875 ◽  
Author(s):  
Malcolm S. Buchanan ◽  
Melvyn Gill ◽  
Jin Yu ◽  
Somphone Phonh-Axa
Keyword(s):  
Spectroscopic Data ◽  
Macrocyclic Lactone ◽  
Unique Combination ◽  
Indigenous Australian ◽  
The Absolute ◽  
Absolute Stereochemistry

Dermocanarin 7 (3), a unique combination of a macrocyclic lactone of the dermocanarin class with an oxanthrone, is isolated from an indigenous Australian toadstool belonging to the genus Dermocybe. The structure of dermocanarin 7 (3) is determined mainly from spectroscopic data, while the absolute stereochemistry at the three chiral centres and at the chiral axis follows from the c.d. spectrum of (3) and the results of NOESY and other n.m.r. experiments.

A New Brominated Diphenyl Ether from the Marine Sponge Dysidea herbacea.

2000 ◽  
Vol 53 (4) ◽  
pp. 299 ◽  
Author(s):  
Bruce F. Bowden ◽  
Leanne Towerzey ◽  
Peter C. Junk
Keyword(s):  
Great Barrier Reef ◽  
Marine Sponge ◽  
Polybrominated Diphenyl Ethers ◽  
Diphenyl Ether ◽  
Two Dimensional ◽  
Barrier Reef ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diphenyl Ethers ◽  
Dysidea Herbacea

Samples of Dysidea herbacea collected at Pelorus Island, Great Barrier Reef, Australia, afforded a new polybrominated diphenyl ether (1). The structure was determined by n.m.r. two-dimensional methods and by an X-ray diffraction study. N.m.r. spectral assignments for (1) and some previously reported isomeric polybrominated diphenyl ethers are discussed.

A New Series of Diterpenes from Australian Spongia Species

1979 ◽  
Vol 32 (4) ◽  
pp. 867 ◽  
Author(s):  
R Kazlauskas ◽  
PT Murphy ◽  
RJ Wells ◽  
K Noack ◽  
WE Oberhansli ◽  
...  
Keyword(s):  
Great Barrier Reef ◽  
Single Crystal ◽  
Absolute Configuration ◽  
Spectral Methods ◽  
Barrier Reef ◽  
X Ray ◽  
The Absolute ◽  
New Compounds ◽  
The Relationship ◽  
Circular Dichroïsm

Great Barrier Reef sponges of the genus Spongia have yielded eight closely related tetracyclic furanoditerpenes. The structures, assigned on the basis of spectral methods, have been confirmed by a single-crystal X-ray analysis of one of the metabolites and the relative stereochemical features have been defined. The absolute configuration of this metabolite was determined by circular dichroism, which allowed the relationship between the eight new compounds to be determined.

scholarly journals A New Isoflavan From the Heartwood of Dalbergia cochinchinensis

2021 ◽  
Vol 16 (10) ◽  
pp. 1934578X2110496
Author(s):  
Yanxia Zhong ◽  
Jiao Chen ◽  
Xinliang Mo ◽  
Zhifang Xu ◽  
Shengxiang Qiu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Bacillus Thuringiensis ◽  
2D Nmr ◽  
Shigella Dysenteriae ◽  
Two Dimensional ◽  
One Dimensional ◽  
Spectroscopic Analyses ◽  
Absolute Stereochemistry

A new isoflavan, named dalbergiacochan A (1), was isolated from the heartwood of Dalbergia cochinchinensis, along with two known isoflavans, namely mucronulatol (2) and 2′-O-methylsepiol (3). Their structures were elucidated based on extensive spectroscopic analyses, including one-dimensional (1D) and two-dimensional nuclear magnetic resonance (2D NMR), and mass spectroscopy (MS) data, and the absolute stereochemistry of compound 1 was determined as R-3′,6-dihydroxy-2′,4′,8-trimethoxyisoflavan from its circular dichroism spectrum. Compound 1 was inactive against Escherichia coli, Bacillus thuringiensis, and Shigella dysenteriae.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

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