Article

Two pairs of enantiomeric neolignans from Lobelia chinensis.

Institute of Traditional Chinese Medicine and Natural Products, Jinan University, Guangzhou 510632, PR China.
Natural product communications (impact factor: 1.24). 10/2010; 5(10):1627-30. pp.1627-30
Source: PubMed

ABSTRACT A pair of new enantiomeric neolignans, ethyl 3-[(2R,3S)-2-(4-hydroxy-3-methoxyphenyl)-3-(hydroxymethyl)-7-methoxy-2,3-dihydro-1-benzofuran-5-yl] propanoate (+) (1) and ethyl 3-[(2S,3R)-2-(4-hydroxy-3-methoxyphenyl)-3-(hydroxymethyl)-7-methoxy-2,3-dihydro-1-benzofuran-5-yl] propanoate (-) (1), together with a pair of known enantiomeric neolignans (+) (2) and (-) (2), as well as five known lignans (3-7) were isolated from the ethanol extract of Lobelia chinensis. Their structures were elucidated on the basis of extensive spectroscopic analyses, including 1D and 2D NMR, HR-ESI-MS and CD spectra.

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Keywords

2D NMR
 
enantiomeric neolignans
 
ethanol
 
Lobelia chinensis
 
new enantiomeric neolignans