TY - JOUR
T1 - A new C-Glycosylflavone from Encyclia michuacana
AU - Tovar-Gijón, Claudia E.
AU - Hernández-Carlos, Beatriz
AU - Burgueño-Tapia, Eleuterio
AU - Cedillo-Portugal, Ernestina
AU - Joseph-Nathan, Pedro
PY - 2006/2/6
Y1 - 2006/2/6
N2 - The methanol extracts from Encyclia michuacana tubercles yielded the new 8-C-(6-deoxy-β-d-glucopyranosyl)apigenin (1) together with known 1-(3′-hydroxy-5′-methoxyphenyl)-2-(4″-hydroxy-5″- methoxyphenyl)ethane (2) and 2-(4-hydroxybenzyl)malic acid (3). The new structure was elucidated using spectroscopic methods, mainly 1D and 2D NMR. The β-anomer for 1 was supported by comparison of the experimental 1H-1H coupling constant values with those generated employing a generalized Karplus-type relationship using dihedral angles extracted from DFT calculations.
AB - The methanol extracts from Encyclia michuacana tubercles yielded the new 8-C-(6-deoxy-β-d-glucopyranosyl)apigenin (1) together with known 1-(3′-hydroxy-5′-methoxyphenyl)-2-(4″-hydroxy-5″- methoxyphenyl)ethane (2) and 2-(4-hydroxybenzyl)malic acid (3). The new structure was elucidated using spectroscopic methods, mainly 1D and 2D NMR. The β-anomer for 1 was supported by comparison of the experimental 1H-1H coupling constant values with those generated employing a generalized Karplus-type relationship using dihedral angles extracted from DFT calculations.
KW - 2-(4-hydroxybenzyl)malic acid
KW - 8-C-(6-deoxy-β-D-glucopyranosyl) apigenin
KW - C NMR
KW - Encyclia michuacana
KW - Gigantol
KW - H NMR
UR - http://www.scopus.com/inward/record.url?scp=31844448141&partnerID=8YFLogxK
U2 - 10.1016/j.molstruc.2005.08.024
DO - 10.1016/j.molstruc.2005.08.024
M3 - Artículo
SN - 0022-2860
VL - 783
SP - 96
EP - 100
JO - Journal of Molecular Structure
JF - Journal of Molecular Structure
IS - 1-3
ER -