The primary metabolism of 3-phenoxybenzyl pyrethroids by microsomal P450 monooxygenases commonly results in hydroxylation at the 2'- or 4'-positions. This paper reports the synthesis of these types of metabolites directly from five pyrethroids: deltamethrin, permethrin, fenvalerate, acrinathrin, and bifenthrin. The reactions were electrophilic substitutions using organometallic reagents. When these pyrethroids were reacted with lead tetrakis(trifluoroacetate) in trifluoroacetic acid followed by hydrolysis in K2CO3, 2'- and 4'-hydroxy derivatives of the 3-phenoxybenzyl group were found as the major products. For bifenthrin, which is a 2-methylbiphenyl-3-yl pyrethroid, 5- and 4'-hydroxy products were formed. This simple synthetic procedure will be valuable for generating authentic standards for pyrethroid metabolism studies.
Development of Immunoassays for Type II Synthetic Pyrethroids. 1. Hapten Design and Application to Heterologous and Homologous Assays
作者:Nanju Lee、David P. McAdam、John H. Skerritt
DOI:10.1021/jf970438r
日期:1998.2.1
of linkers with and without bulky groups in the enzyme conjugate to reduce antibody affinities for the spacer arm in the immunoassay. The first approach resulted in the preparation of three series of haptens with a spacer attached (1) at the aromatic moiety of pyrethroid, (2) through the middle of the molecule, and (3) at the cyclopropane moiety. Haptens based on the derivatives of the pyrethroid metabolites