Total NMR assignments of new [C7OC7″]-biflavones from leaves of the limonene–carvone chemotype of Lippia alba (Mill) N. E. Brown
✍ Scribed by Francisco Geraldo Barbosa; Mary Anne Sousa Lima; Edilberto Rocha Silveira
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 116 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1546
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✦ Synopsis
Abstract
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~OC~7″~]‐biflavone (1) and 4′,4,5,5″‐tetrahydroxy‐6,6″,3″′‐trimethoxy‐[C~7~OC~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 © 2005 John Wiley & Sons, Ltd.