Structure and Antimicrobial Activity of Phloroglucinol Derivatives from Achyrocline satureioides

CARINA CASERO; FÉLIX MACHIN; SEBASTIÁN MÉNDEZ-ALVAREZ; MIRTA DEMO; ÁNGEL G. RAVELO; NURY PÉREZ-HERNÁNDEZ; PEDRO JOSEPH-NATHAN

JOURNAL OF NATURAL PRODUCTS

AMER CHEMICAL SOC

Lugar: Washington; Año: 2015 vol. 78 p. 93 - 102

0163-3864

The new prenylated phloroglucinol α-pyrones 1−3 and the new dibenzofuran 4, together with the known 23-methyl-6-O-demethylauricepyrone (5), achyrofuran (6), and 5,7-dihydroxy-3,8-dimethoxyflavone (gnaphaliin A), were isolated from the aerial parts of Achyrocline satureioides. Their structures were determined by 1D and 2D NMR spectroscopic studies, while the absolute configuration of the sole stereogenic center of 1 was established by vibrational circular dichroism measurements in comparison to density functional theory calculated data. The same (S) absolute configuration of the α-methylbutyryl chain attached to the phloroglucinol nucleus was assumed for compounds 2−6 based on biogenetic considerations. Derivatives 7−16 were prepared from 1 and 5, and the antimicrobial activities of the isolated metabolites and some of the semisynthetic derivatives against a selected panel of Gram-positive and Gram-negative bacteria, as well as a set of yeast molds, were determined.