Laurencia natural products. Part I. Crystal structure and absolute stereochemistry of laurencin

1969 ◽  
pp. 559 ◽  
Author(s):  
A. Forbes Cameron ◽  
K. K. Cheung ◽  
G. Ferguson ◽  
J. Monteath Robertson
Keyword(s):  
Crystal Structure ◽  
Natural Products ◽  
Absolute Stereochemistry

Aplysinol from : crystal structure and absolute stereochemistry

1977 ◽  
Vol 18 (35) ◽  
pp. 2998
Author(s):  
Joyce A. McMillan ◽  
Iain C. Paul ◽  
Salvatore Caccamese ◽  
Kenneth L. Rinehart
Keyword(s):  
Crystal Structure ◽  
Absolute Stereochemistry

scholarly journals Synthetic study of ravidomycin, a hybrid natural product

2000 ◽  
Vol 72 (9) ◽  
pp. 1783-1786 ◽  
Author(s):  
Keisuke Suzuki
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Natural Product ◽  
Amino Sugar ◽  
Antitumor Antibiotics ◽  
Ready Availability ◽  
Silyl Acetals ◽  
Gilvocarcin V ◽  
Absolute Stereochemistry

Strategies and tactics associated with the total synthesis of hybrid natural products are discussed. The target is ravidomycin (2), one of the gilvocarcin-class antitumor antibiotics with an aryl C-glycoside structure. The first total synthesis of 2, which was achieved along similar lines of that of gilvocarcin V (1), served for the determination of the relative as well as the absolute stereochemistry of 2. Also revealed was a limitation of the synthetic scheme so long as the amino sugar congener was concerned. A preliminary result is discussed on the [2+2+2] approach that relies on the ready availability of various benzocyclobutene derivatives via regioselective [2+2] cycloaddition of α-alkoxybenzynes and ketene silyl acetals.

Absolute stereochemistry of disidein and of two new related halogenated sesterterpenoids. Two-dimensional nmr studies and x-ray crystal structure

Tetrahedron ◽  
1987 ◽  
Vol 43 (20) ◽  
pp. 4777-4784 ◽  
Author(s):  
G. Cimino ◽  
S. De Rosa ◽  
S. De Stefano ◽  
R. Puliti ◽  
G. Strazzullo ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Two Dimensional ◽  
Nmr Studies ◽  
X Ray ◽  
Absolute Stereochemistry

Aplysinol from laurencia decidua: crystal structure and Absolute stereochemistry

1976 ◽  
Vol 17 (47) ◽  
pp. 4219-4222 ◽  
Author(s):  
Joyce A. McMillan ◽  
Iain C. Paul ◽  
Salvatore Caccamese ◽  
Kenneth L. Rinehart
Keyword(s):  
Crystal Structure ◽  
Absolute Stereochemistry

HIV inhibitory natural products. 11. Structure, absolute stereochemistry, and synthesis of conocurvone, a potent, novel HIV-inhibitory naphthoquinone trimer from a Conospermum sp

1993 ◽  
Vol 115 (15) ◽  
pp. 6673-6679 ◽  
Author(s):  
Laurent A. Decosterd ◽  
Ian C. Parsons ◽  
Kirk R. Gustafson ◽  
John H. Cardellina ◽  
James B. McMahon ◽  
...  
Keyword(s):  
Natural Products ◽  
Absolute Stereochemistry

Dichlorolissoclimide fromLissoclinum voeltzkowiMichaelson (Urochordata):  Crystal Structure and Absolute Stereochemistry

1996 ◽  
Vol 59 (12) ◽  
pp. 1203-1204 ◽  
Author(s):  
Loïc Toupet ◽  
Jean-François Biard ◽  
Jean-François Verbist
Keyword(s):  
Crystal Structure ◽  
Absolute Stereochemistry

scholarly journals Rigid and concave, 2,4-cis-substituted azetidine derivatives: A platform for asymmetric catalysis

2018 ◽  
Author(s):  
Akina Yoshizawa ◽  
Antonio Feula ◽  
Louise Male ◽  
Andrew G. Leach ◽  
John Fossey
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Asymmetric Catalysis ◽  
Enantiomeric Excess ◽  
Platinum Complex ◽  
Crystal Structure Analysis ◽  
Single Crystal Structure ◽  
Complex Catalyst ◽  
Reaction Conditions ◽  
Absolute Stereochemistry

A series of single enantiomer, 2,4-<i>cis</i>-disubstituted amino azetidines were synthesised and used as ligands for copper-catalysed Henry reactions of aldehydes with nitromethane. Optimisation of ligand substituents and the reaction conditions was conducted. The enantiomeric excess of the formed products was highest when alkyl aldehydes were employed in the reaction (>99% e.e.). The absolute stereochemistry of one representative azetidine derivative salt was determined by analysis of the Flack parameter of an XRD single crystal structure. The origin of selectivity in catalysis was investigated computationally, revealing the importance of the amino-substituent in determining the stereochemical outcome. A racemic platinum complex of a <i>cis</i>-disubstituted azetidine is examined by XRD single crystal structure analysis with reference to its steric parameters, and analogies to the computationally determined copper complex catalyst are drawn.<br>

The Constituents of Marine Sponges. VII. The Absolute Stereochemistry of Aplyroseol-1.

1997 ◽  
Vol 50 (4) ◽  
pp. 391 ◽  
Author(s):  
Trevor W. Hambley ◽  
Walter C. Taylor ◽  
Stephen Toth
Keyword(s):  
Crystal Structure ◽  
Marine Sponges ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
The Absolute ◽  
Absolute Stereochemistry

The absolute stereochemistry of aplyroseol-1 (1), a diterpenoid isolated from Aplysillarosea Barrois, has been established as (5S; 7R; 8S; 9R; 10S; 13R; 14R; 15R) by determining the crystal structure of the p-bromobenzoyl derivative (3) by X-ray diffraction methods. The structure was refined to a residual of 0·032 for 1451 independent observed reflections. The crystals are monoclinic, space group P 21, a 6·668(8), b 20·04(1), c 10·974(3) Å, β 98·04(7)°.

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