N-Alkyl-N-(5-isothiazolyl)- and N-(Alkylisothiazolin-5-ylidene)- phenylacetamides. Synthesis and Biological Activity
摘要:
Treatment of 5-amino-4-chloro-3-methylisothiazole (3) with the acid chloride of [p-[(alpha,alpha,alpha-trifluoro-p-tolyl)oxy]phenyl]acetic acid (6) afforded the amide N-(4-chloro-3-methyl-5-isothiazolyl)-2-[p-[(alpha,alpha, alpha-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-[(alpha,alpha,alpha-trifluoro-p-tolyl)oxy]phenyl]acetamides (a), and ring-nitrogen substitution, N-(2-alkyl-4-chloro-3-methyl-3-isothiazolin-5-ylidene)-2-[p- [(alpha,alpha,alpha-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-d(5) 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.
N-Alkyl-N-(5-isothiazolyl)- and N-(Alkylisothiazolin-5-ylidene)- phenylacetamides. Synthesis and Biological Activity
摘要:
Treatment of 5-amino-4-chloro-3-methylisothiazole (3) with the acid chloride of [p-[(alpha,alpha,alpha-trifluoro-p-tolyl)oxy]phenyl]acetic acid (6) afforded the amide N-(4-chloro-3-methyl-5-isothiazolyl)-2-[p-[(alpha,alpha, alpha-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-[(alpha,alpha,alpha-trifluoro-p-tolyl)oxy]phenyl]acetamides (a), and ring-nitrogen substitution, N-(2-alkyl-4-chloro-3-methyl-3-isothiazolin-5-ylidene)-2-[p- [(alpha,alpha,alpha-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-d(5) 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.
Chemoselective Decarboxylative Oxygenation of Carboxylic Acids To Access Ketones, Aldehydes, and Peroxides
作者:Renpeng Guan、Guanhong Chen、Elliot L. Bennett、Zhiliang Huang、Jianliang Xiao
DOI:10.1021/acs.orglett.3c00649
日期:2023.4.14
Reported here is a photocatalytic strategy for the chemoselective decarboxylative oxygenation of carboxylicacids using Ce(III) catalysts and O2 as the oxidant. By simply changing the base employed, we demonstrate that the selectivity of the reaction can be channeled to favor hydroperoxides or carbonyls, with each class of products obtained in good to excellent yields and high selectivity. Notably
此处报道的是一种使用 Ce(III) 催化剂和 O 2作为氧化剂的羧酸化学选择性脱羧氧化的光催化策略。通过简单地改变所用的碱,我们证明反应的选择性可以引导到有利于氢过氧化物或羰基化合物,每一类产品都以良好到极好的收率和高选择性获得。值得注意的是,有价值的酮、醛和过氧化物是直接从容易获得的羧酸中生产出来的,无需额外的步骤。
[EN] 4-(ARALKOXY OR ARALKYLAMINO)PYRIDINE PESTICIDES_________________
申请人:DOWELANCO
公开号:WO1993005050A1
公开(公告)日:1993-03-18
(EN) 4-(Aralkoxy or aralkylamino)pyridines, for example 4-[2-[4-(2,2,2-trifluoroethoxy)phenyl]ethoxy]pyridine, are active against nematodes, insects, mites, and plant pathogens.(FR) Les composés 4-(aralcoxy ou aralkylamino)pyridines, par exemple 4-[2-[4-(2,2,2, tri-fluoroéthoxy)phényl]éthoxy]pyridine sont actifs contre les nématodes, les insectes, les mites et les agents pathogènes végétaux.