Semisynthesis and antifeedant activity of new derivatives of a dihydro-?-agarofuran from Parnassia wightiana.

ABSTRACT: Five new derivatives (2-6) were semi-synthesized using compound 1, a dihydro-?-agarofuran sesquiterpene with C-2 ketone obtained from Parnassia wightiana, as the starting material by acylation, oxidation, reduction, esterification, and amination, respectively. Structures of 2-6 were confirmed by 1D- and 2D-NMR and HR-ESI-MS spectra. In addition, antifeedant activities of these compounds (1-6) were tested against the 3rd-instar larvae of Mythimna separata. Antifeedant effects of compounds 2 and 4 were greater than the parent compound 1 whereas other compounds exhibited low to no feeding deterrent effects against third instar M. separata larvae in lab bioassays. Therefore, our results suggest that acylated and reduced derivatives at C-8 and C-2, respectively, of 1 may improve the antifeeding effect. This preliminary information will be useful in designing new insect control agents against M. separata and other important pests.

SUBMITTER: Tang JJ 

PROVIDER: S-EPMC3821568 | biostudies-literature | 2013 Sep

REPOSITORIES: biostudies-literature