Total NMR assignments of new[C7-O-C7"]-biflavones from leaves of the limonene-carvone chemotype of Lippia alba (Mill) N.E. Brown

被引：13

作者：

Barbosa, FG ^{[1
]}

Lima, MAS ^{[1
]}

Silveira, ER ^{[1
]}

机构：

[1] Univ Fed Ceara, Dept Quim Organ & Inorgan, Ctr Ciencias, Curso Posgrad Quim Organ, BR-60451970 Fortaleza, Ceara, Brazil

来源：

MAGNETIC RESONANCE IN CHEMISTRY | 2005年 / 43卷 / 04期

关键词：

NMR; H-1; C-13; 1D NMR; 2D NMR; chemical shift assignment; C-7-O-C-7 '']-biflavonoids; Lippia alba;

D O I：

10.1002/mrc.1546

中图分类号：

O6 [化学];

学科分类号：

0703 [化学];

摘要：

Phytochemical analysis of leaves of the limonene-carvone chemotype of Lippia alba led to the isolation of two biflavonoids with a new structural pattern with an ether linkage: 5,5"-dihydroxy-6,4',6",3"',4"'-pentamethoxy-[C-7-O-C-7"]-biflavone (1) and 4',4,5,5"-tetrahydroxy-6,6",3"'-trimethoxy-[C-7-O-C-7"]-biflavone (2). Structural elucidation of the new compounds was established on the basis of spectral data, through the use of 1D NMR and several 2D shift correlated NMR pulse sequences (COSY, HMQC, HMBC and NOESY). Copyright (c) 2005 John Wiley P Sons, Ltd.

引用

页码：334 / 338

页数：5

共 15 条

[1]

Agrawal P.K., 1989, Carbon-13 NMR of Flavonoids

[2]

Oligomeric flavonoids -: Part 32 -: Structure and synthesis of ether-linked proteracacinidin and promelacacinidin proanthocyanidins from Acacia caffra [J].