ChemInform Abstract: Principles and Applications of Modern 2D NMR Techniques in Structure Elucidation of Complex Natural Products

ChemInform ◽  
2010 ◽  
Vol 23 (42) ◽  
pp. no-no
Author(s):  
ATTA-UR-RAHMAN ATTA-UR-RAHMAN ◽  
M. I. CHOUDHARY ◽  
A. PERVIN
Keyword(s):  
Natural Products ◽  
Structure Elucidation ◽  
2D Nmr ◽  
Nmr Techniques

Nuclear Magnetic Resonance Spectroscopic Behaviour of Some Selective Natural Flavonoids: A Look Through

2020 ◽  
Vol 17 (2) ◽  
pp. 185-196
Author(s):  
Shyamal K. Jash ◽  
Dilip Gorai ◽  
Lalan C. Mandal ◽  
Rajiv Roy
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Natural Products ◽  
Magnetic Resonance ◽  
Hard Core ◽  
2D Nmr ◽  
Vital Role ◽  
Spectral Technique ◽  
Nmr Techniques ◽  
Significant Class ◽  
Nuclear Magnetic

Flavonoids are considered as a significant class of compounds among the natural products, exhibiting a variety of structural skeletons as well as multidirectional biological potentials. In structural elucidations of natural products, Nuclear Magnetic Resonance (NMR) spectroscopy has been playing a vital role; the technique is one of the sharpest tools in the hands of natural products chemists. The present resume deals with hard-core applications of such spectral technique, particularly in structural elucidation of flavonoids; different NMR techniques including 1H-NMR, 13C-NMR, and 2D-NMR [viz. 1H-1H COSY, COLOC, HMBC, HMQC] are described in detail.

Rarely Occurring Natural Products Isolated from Vincetoxicum stocksii

2019 ◽  
Vol 41 (4) ◽  
pp. 695-695
Author(s):  
Saima Khan Saima Khan ◽  
Muhammad Imran Tousif Muhammad Imran Tousif ◽  
Naheed Raiz Naheed Raiz ◽  
Mamona Nazir Mamona Nazir ◽  
Mahreen Mukhtar Mahreen Mukhtar ◽  
...  
Keyword(s):  
Natural Products ◽  
Methanol Extract ◽  
High Resolution Mass Spectrometry ◽  
Ethyl Acetate Fraction ◽  
2D Nmr ◽  
Ethyl Carbamate ◽  
Carbamic Acid ◽  
Nmr Analysis ◽  
Nmr Techniques ◽  
Resolution Mass

Silica gel column chromatography of the ethyl acetate fraction of methanol extract of Vincetoxicum stocksii resulted in the separation of three new rarely occurring natural products; [4-(4-(methoxycarbonyl)benzyl)phenyl] carbamic acid (1), bis[di-p-phenylmethane]ethyl carbamate (2), methyl 2-hydroxy-3-(2-hydroxy-5-(3-methylbut-2-enyl)phenyl)-2-(4-hydroxyphenyl) propanoate, stocksiloate(3), along with five known compounds; 1-(4-hydroxy-3-methoxyphenyl)-1,2,3,-propanetriol (4), feruloyl-6-O-β-D-glucopyranoside (5), 4-hydroxy-3,5-dimethoxybenzoic acid (6), apocynin (7) and vincetomine (8). The structures of compounds 1 and 2 were established with help of 1D, 2D-NMR techniques and high resolution mass spectrometry, whereas, compound 3 could only be characterized tentatively by 1D, 2D-NMR techniques. Compounds 1 is new compound while 2 is synthetically known but never been reported from natural source. The known compounds were identified due to 1D NMR analysis and in comparison with the literature values. Compounds 1-3 were found inactive in an anti-urease assay.

Computer-assisted structure elucidation of natural products with limited 2D NMR data: application of the StrucEluc system

2003 ◽  
Vol 41 (5) ◽  
pp. 359-372 ◽  
Author(s):  
Kirill A. Blinov ◽  
Dean Carlson ◽  
Mikhail E. Elyashberg ◽  
Gary E. Martin ◽  
Eduard R. Martirosian ◽  
...  
Keyword(s):  
Natural Products ◽  
Structure Elucidation ◽  
2D Nmr ◽  
Computer Assisted ◽  
Nmr Data ◽  
Data Application ◽  
Computer Assisted Structure Elucidation

2D-NMR of natural products, part V Structure elucidation and complete1H- and13C-assignment of resin acid derivatives

1984 ◽  
Vol 115 (5) ◽  
pp. 597-603 ◽  
Author(s):  
Ernst Haslinger ◽  
Hermann Kalchhauser ◽  
Wolfgang Robien ◽  
Harald Steindl
Keyword(s):  
Natural Products ◽  
Structure Elucidation ◽  
Resin Acid ◽  
2D Nmr

NMR Techniques for the Structure Elucidation and Conformational Analysis of Natural Products

1988 ◽  
pp. 19-42 ◽  
Author(s):  
Geoffrey A. Cordell ◽  
Gábor Blaskó ◽  
Matthias O. Hamburger ◽  
Ze-Yuan Luo ◽  
Helga Shieh ◽  
...  
Keyword(s):  
Natural Products ◽  
Conformational Analysis ◽  
Structure Elucidation ◽  
Nmr Techniques
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