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Baeckeins A and B, Two Novel 6-Methylflavonoids from the Roots of Baeckea frutescens

✍ Scribed by Bei-Xi Jia; Jie Yang; Xiao-Qing Chen; Yuan Cao; Mao-Xiang Lai; Qiang Wang

Publisher: John Wiley and Sons
Year: 2011
Tongue: German
Weight: 276 KB
Volume: 94
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.201100176

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✦ Synopsis

Abstract

A pair of novel isomeric 6‐methylflavonoids, named baeckeins A (1) and B (2), were isolated from the roots of Baeckea frutescens. The two compounds possess a unique C~23~ skeleton, resulting from the 6‐methylation and 8‐arylation of a flavonol (=3‐hydroxy‐2‐phenyl‐4__H__‐1‐benzopyran‐4‐one) framework and the formation of an unusual lactone ring E. Their structures were elucidated by detailed spectroscopic analyses, including HR‐ESI‐MS and 1D‐ and 2D‐NMR data (HSQC, HMBC, and ROESY). A plausible biogenetic pathway for compounds 1 and 2 is also proposed (Scheme).

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