Screening of Dialkoxybenzenes and Disubstituted Cyclopentene Derivatives against the Cabbage Looper, Trichoplusia ni, for the Discovery of New Feeding and Oviposition Deterrents
作者:Yasmin Akhtar、Murray B. Isman、Peggy M. Paduraru、Srinivas Nagabandi、Ranjeet Nair、Erika Plettner
DOI:10.1021/jf071636d
日期:2007.12.1
with some exhibiting strong toxic and oviposition deterrent effects as well. Our results suggest some structure-function relationships within these libraries. Replacement of a methyl group with larger alkyl substituents increased the feeding deterrent effects in most cases. The presence of a free hydroxyl group, irrespective of the carbon framework or alkyl substituent, served to reduce feeding deterrent
Synthesis and biological activity of conformationally restricted gypsy moth pheromone mimics
作者:Hao Chen、Yongmei Gong、Regine M. Gries、Erika Plettner
DOI:10.1016/j.bmc.2010.02.061
日期:2010.4
The design and synthesis of a series of conformationally constrained mimics of gypsy moth sex pheromone, (+)-disparlure (7R,8S)-2-methyl-7,8-epoxyoctadecane, are described. The core structure of the mimics is derived from 5-(2'-hydroxyethyl) cyclopent-2-en-1-ol. Substituent optimization of the analogs was accomplished through the synthesis of mini-libraries and pure individual compounds, followed by electrophysiological experiments with male gypsy moth antennae. The electroantennogram results show that the analogs elicited weak to no antennal responses themselves. There was a clear structure-activity pattern for odorant activity, with ethyl substituents being best. Further, when puffed simultaneously with the pheromone, some of the compounds gave a significant enhancement of the antennal depolarization, indicating an additive or synergistic effect. A pure pheromone stimulus following a mixed compound/pheromone stimulus was generally not affected, with two exceptions: one compound enhanced and another inhibited a subsequent stimulus. The compounds also prolonged the stimulation of the antenna, which manifested itself in widened electroantennogram peaks. We tested the hypothesis that this prolonged stimulation may be due to the stabilization of a particular conformer of the pheromone-binding protein (PBP). Compounds that caused PBP2 to adopt a similar conformation than in the presence of pheromone also caused peak widening. This was not the case with PBP1. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of Enantiopure Alicyclic Ethers and Their Activity on the Chemosensory Organ of the Ectoparasite of Honey Bees, <i>Varroa destructor</i>
作者:Govardhana R. Pinnelli、Nitin K. Singh、Victoria Soroker、Erika Plettner
DOI:10.1021/acs.jafc.6b03492
日期:2016.11.16
opent-2-ene, cy2,2}—could have opposite active enantiomers. Here we studied the enantiomers of both ethers, whose preparation involved enzymatic resolution of racemic diol cis-5-(2′-hydroxyethyl)cyclopent-2-en-1-ol using Lipase AK with vinyl acetate. The racemic diol was prepared fromcommercially available 2,5-norbornadiene. We observed that the responses of the chemosensory organ to honey bee head