4 article(s) from Sharma, Amit Raj
Graphical Abstract
Figure 1: Structures of tenacibactins K–M (1–3).
Figure 2: Key 2D-NMR correlations for 1–3.
Figure 3: (a) Partial 1H NMR spectra of 1 at 25 and 50 °C in DMSO-d6; (b) magnified HMBC spectrum of 1 at 25 ...
Figure 4: MS/MS spectrum of 1 acquired on a quadrupole time-of-flight mass spectrometer in the negative ion m...
Scheme 1: MS/MS fragmentation pathway for compound 1.
Graphical Abstract
Figure 1: Structure of the nocarimidazoles 1–4 and the bulbimidazoles 5–7.
Figure 2: COSY and key HMBC correlations for 1 and 2.
Scheme 1: Synthesis of the model compounds 8 and 9.
Figure 3: 1JC,H coupling constant for the imidazole ring of the natural products 1 and 5 and the model compou...
Figure 4: Determination of the absolute configuration of 1 (a), 4 (b), and 5 (c) by the Ohrui–Akasaka method.
Figure 5: Stereochemical diversity of the anteiso-chain chirality in microbial metabolites.
Graphical Abstract
Figure 1: Structures of (6E,8Z)- and (6E,8E)-5-oxo-6,8-tetradecadienoic acids (1 and 2).
Figure 2: COSY and key HMBC correlations for 1 and 2.
Figure 3: Spin system simulation for the C8–C9 double bond of 2.
Figure 4: Natural keto fatty acids of various origins.
Figure 5: PPAR activation by 1 and 2.
Graphical Abstract
Figure 1: Structure of (2Z,4E)-3-methyl-2,4-decadienoic acid (1).
Figure 2: COSY and key HMBC correlations for 1.
Figure 3: Methylation pattern that can occur in fatty acids and polyketides.
Scheme 1: C-Methylation of alkenyl carbon in sphingolipid biosynthesis.
Figure 4: Incorporation of 13C-labeled precursors into 1.
Scheme 2: Biosynthesis of tuberculostearic acid in Mycobacterium.
Scheme 3: Possible methylation mechanism for compound 1.