189291-60-9Relevant articles and documents
N-Alkyl-N-(5-isothiazolyl)- and N-(Alkylisothiazolin-5-ylidene)-phenylacetamides. Synthesis and Biological Activity
Samaritoni, Jack G.,Arndt, Lena,Bruce, Timothy J.,Dripps, James E.,Gifford, James,Hatton, Christopher J.,Hendrix, William H.,Schoonover, Joseph R.,Johnson, George W.,Hegde, Vidyadhar B.,Thornburgh, Scott
, p. 1920 - 1930 (1997)
Treatment of 5-amino-4-chloro-3-methylisothiazole (3) with the acid chloride of [p-[(α,α,α-trifluoro-p-tolyl)oxy]phenyl]acetic acid (6) afforded the amide N-(4-chloro-3-methyl-5-isothiazolyl)-2-[p-[(α,α,α-trifluoro-p- tolyl)oxy]phenyl]acetamide (1), which was substituted with various alkyl groups in an effort to alleviate toxicity toward non-target organisms through a proinsecticide approach. Alkylations of 1 under a variety of reaction conditions afforded two major products which were derived from amide-nitrogen substitution, N-alkyl-N-(4-chloro-3-methyl-5-isothiazolyl)-2-[p-[(α,α,α- trifluoro-p-tolyl)oxy]phenyl]acetamides (7), and ring-nitrogen substitution, N-(2-alkyl-4-chloro-3-methyl-3-isothiazolin-5-ylidene)-2-[p-[(α,α, α-trifluoro-p-tolyl)oxy]phenyl]acetamides (8). Derivatives 7 and 8 were found to exhibit lessened toxicity to trout as well as insects, but, in general, efficacy toward insects was retained to a greater degree. In particular methoxymethyl, ethoxymethyl, ethyl, and ethyl-d5 substituents demonstrated the best combination of insect efficacy and safening toward trout. Significantly different in vivo efficacies of the N-methyl and N-CD3 analogs suggest that 7 and 8 are proinsecticides requiring activation by dealkylation.
