Elsevier

Phytochemistry

Volume 11, Issue 9, September 1972, Pages 2821-2826
Phytochemistry

Methylated flavonols in Larrea cuneifolia

https://doi.org/10.1016/S0031-9422(00)86519-XGet rights and content

Abstract

Nine of eleven methylated flavonols isolated from Larrea cuneifolia Cav. collected in Argentina have been fully characterized. UV, MS and NMR spectral data are presented for the nine substances all of which were identified as methyl ethers of quercetin and kaempferol. Two of the compounds, 7,3′,4′-trimethylquercetin (II) and 3,7,3′-trimethylquercetin (III), are new natural products. The others are 3,7,3′,4′-tetramethylquercetin (I) (retusine), 3,7-dimethylkaempferol (IV), 7,3′-dimethylquercetin (V) (rhamnazin), 3,7-dimethylquercetin (VI) (kumatakenin), 3,3′-dimethylquercetin (VII), 3-methylkaempferol (VIII) and 3′-methylquercetin (IX) (isorhamnetin). Nordihydroguaiaretic acid (XII) was also detected.

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1

Most of this work was carried out by the senior author during a 1971 tenure at The University of Texas at Austin.

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