Synthetic Studies on Gambieric Acids, Potent Antifungal Polycyclic Ether Natural Products: Reassignment of the Absolute Configuration of the Nonacyclic Polyether Core by NMR Analysis of Model Compounds

2009 ◽  
Vol 74 (11) ◽  
pp. 4024-4040 ◽  
Author(s):  
Haruhiko Fuwa ◽  
Kazuya Ishigai ◽  
Tomomi Goto ◽  
Akihiro Suzuki ◽  
Makoto Sasaki
Keyword(s):  
Natural Products ◽  
Absolute Configuration ◽  
Nmr Analysis ◽  
Model Compounds ◽  
The Absolute ◽  
Synthetic Studies ◽  
Polycyclic Ether

scholarly journals Colletinin A and 2,2″-Diepicolletinin A: Two New Bisflavan-3-ols from Rhododendron Collettianum

2008 ◽  
Vol 3 (5) ◽  
pp. 1934578X0800300
Author(s):  
Viqar Uddin Ahmad ◽  
Farman Ullah ◽  
Hidayat Hussain ◽  
Gilles Dujardin ◽  
Arnaud Martel ◽  
...  
Keyword(s):  
Absolute Configuration ◽  
2D Nmr ◽  
Nmr Analysis ◽  
Relative Configuration ◽  
The Absolute

Two new bisflavan-3-ols, named colletinin A (1) and 2,2″-diepicolletinin A (2) have been isolated from Rhododendron collettianum. Their structures were determined by means of 1D and 2D NMR analysis, aided by HREIMS data. The relative configuration was determined by means of 1H-1H NOESY correlation but the absolute configuration could not be established.

scholarly journals A New Bisabolene from Stevia tomentosa

2011 ◽  
Vol 6 (9) ◽  
pp. 1934578X1100600
Author(s):  
Alejandro Valdez-Calderón ◽  
J. Martín Torres-Valencia ◽  
J. Jesús Manríquez-Torres ◽  
René Velázquez-Jiménez ◽  
Mario A. Gómez-Hurtado ◽  
...  
Keyword(s):  
Absolute Configuration ◽  
Coupling Constants ◽  
Spectral Studies ◽  
Dihedral Angles ◽  
Model Compounds ◽  
H Nmr ◽  
Aerial Parts ◽  
The Absolute

The new sesquiterpene (1 R,2 R,3 R,6 R,7 S)-1-acetoxy-2,3-dmydroxy-2,3-dihydrobisabolene (3) together with ten known terpenes and three known flavonoids were isolated from the aerial parts and from the roots of Stevia tomentosa. The structure of 3 follows from spectral studies, the relative chirality at C-3 follows from 1H NMR coupling constants comparison with the corresponding calculated values obtained by applying a generalized Karplus-type relationship to the dihedral angles of model compounds, and the absolute configuration is assumed in analogy to known (2 R,3 R,6 R,7 S)-2,3-epoxy-2,3-dihydrobisabolen-1-one (2).

Determination of the Absolute Configuration of Peptide Natural Products by Using Stable Isotope Labeling and Mass Spectrometry

2012 ◽  
Vol 18 (8) ◽  
pp. 2342-2348 ◽  
Author(s):  
Helge B. Bode ◽  
Daniela Reimer ◽  
Sebastian W. Fuchs ◽  
Ferdinand Kirchner ◽  
Christina Dauth ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Natural Products ◽  
Stable Isotope ◽  
Absolute Configuration ◽  
Isotope Labeling ◽  
Stable Isotope Labeling ◽  
The Absolute
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