Silver-Catalyzed C–H Trifluoromethylation of Arenes Using Trifluoroacetic Acid as the Trifluoromethylating Reagent
摘要:
Direct trifluoromethylation of arenes using TFA as the trifluoromethylating reagent was achieved with Ag as the catalyst. This reaction not only provides a new protocol for aryl CH trifluoromethylation, but the generation of CF3 from TFA may prove useful in other contexts and could potentially be extended to other trifluoromethylation reactions.
strategy for aromatic trifluoromethylation by converting amino into trifluoromethyl groups via a Sandmeyer-type reaction is reported. The transformation involves diazotization of the aromatic amines with tert-butyl nitrite and hydrochloric acid to form aryldiazonium chlorides, followed by trifluoromethylation with trifluoromethylsilver at low temperature. Various readily available aromatic amines are
The aromatic perfluoroalkylation catalyzed by a copper(I) salt with bis(perfluoroalkyl)zinc reagents Zn(RF)2(DMPU)2, which were prepared and then isolated as a stable white powder from perfluoroalkyl iodide and diethylzinc, was accomplished to provide the perfluoroalkylated products in good‐to‐excellent yields. The advantages of this reliable and practical catalytic reaction are 1) air‐stable and easy‐to‐handle
Design, synthesis, insecticidal activity and 3D-QSR study for novel trifluoromethyl pyridine derivatives containing an 1,3,4-oxadiazole moiety
作者:F. Z. Xu、Y. Y. Wang、D. X. Luo、G. Yu、S. X. Guo、H. Fu、Y. H. Zhao、J. Wu
DOI:10.1039/c8ra00161h
日期:——
A series of trifluoromethyl pyridine derivatives containing1,3,4-oxadiazolemoiety was designed, synthesized and bio-assayed for their insecticidal activity. The result of bio-assays indicated the synthesized compounds exhibited good insecticidal activity against Mythimna separata and Plutella xylostella, most of the title compounds show 100% insecticidal activity at 500 mg L−1 and >80% activity at
设计、合成了一系列含有1,3,4-恶二唑部分的三氟甲基吡啶衍生物,并对其杀虫活性进行了生物测定。生物测定结果表明,合成的化合物对Mythimna separata和Plutella xylostella表现出良好的杀虫活性,大多数标题化合物在 500 mg L -1 时表现出 100% 的杀虫活性,在250 mg L -1时表现出大于 80% 的杀虫活性。两种害虫。化合物E18和E27对Mythimna separata的LC 50值分别为38.5和30.8 mg L -1,接近阿维菌素(29.6 mg L -1); 化合物E5、E6、E9、E10、E15、E25、E26和E27在 250 mg L -1下显示出 100% 的活性,优于毒死蜱 (87%)。提出了具有良好可预测性的 CoMFA 和 CoMSIA 模型,表明苯环 2 位和 4 位具有适当体积的吸电子基团可以增强杀虫活性。
Noncovalent Interactions in Ir-Catalyzed C–H Activation: L-Shaped Ligand for Para-Selective Borylation of Aromatic Esters
An efficient strategy for the para-selective borylation of aromatic esters is described. For achieving high para-selectivity, a new catalytic system has been developed modifying the core structure of the bipyridine. It has been proposed that the L-shaped ligand is essential to recognize the functionality of the oxygen atom of the ester carbonyl group via noncovalent interaction, which provides an unprecedented
A series of novel sulfide derivatives containing 1,3,4-oxadiazole and pyridine were synthesized, characterized, and tested for their antibacterial activity against tobacco bacterial wilt and rice bacterial blight and for insecticidal activity toward diamondback moth. The results showed that some compounds had good insecticidal and bactericidal activity, e.g., the activities of compounds 6e and 6g-6j toward tobacco bacterial wilt were much better than those of commercial thiodiazole-copper, and some of the synthesized compounds possessed good insecticidal activity against Plutella xylostella. Compounds 6d, 6h, 6j, 6l, 6p, 6r, and 6p displayed over 93% activity at 500 mg L$^-1}$.