A new chalcone and a flavone from Andrographis neesiana.
Two new flavonoids, 2',4',6',2,3,4-hexamethoxychalcone (1) and 5-hydroxy-7,2',5'-trimethoxyflavone (2) together with a known flavone glycoside, echioidinin 5-O-beta-D-glucopyranoside (3) were isolated from the whole plant of Andrographis neesiana, and the structures were elucidated by electrospray ionization tandem mass spectrometry (ESI-MS/MS) and one- and two-dimensional (1D- and 2D)-NMR spectral studies including 1H-1H correlation spectroscopy (COSY), heteronuclear single quantum coherence (HSQC), heteronuclear multiple bond connectivity (HMBC) and nuclear Overhauser enhancement spectroscopy (NOESY) experiments.
Kesava Reddy
Muntha
M
Natural Products Division, Department of Chemistry, Sri Venkateswara Universit, Tirupati, India.
Vijaya Bhaskar Reddy
Mopuru
M
Anil Kumar Reddy
Bandi
B
Gunasekar
Duvvuru
D
Caux
Cristelle
C
Bodo
Bernard
B
D035685:Andrographis; D002599:Chalcone / Q000737:chemistry* / Q000302:isolation & purification*; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D018514:Plant Structures
D005419:Flavonoids; D010936:Plant Extracts; D002599:Chalcone