合成了一系列新的30种对称双吡啶鎓和相关的N-杂芳族双季铵盐与丙烷-1,3-二基连接基,并表征了它们在加利福尼亚鱼雷的烟碱乙酰胆碱受体(nAChR)MB327结合位点的结合亲和力。靶向此结合位点的化合物对于研究针对有机磷酸酯中毒的新型解毒剂特别感兴趣,因为其具有治疗活性,可被4-叔丁基取代的双吡啶鎓盐MB327以前被鉴定为nAChR再敏化剂。通过新开发的方法可以有效地获得目标化合物,该方法可以使具有多种官能团的空间受阻或电子失活的杂环进行N烷基化。使用最近开发的基于质谱(MS)的结合测定法测定对nAChR处MB327结合位点的结合亲和力,结果表明几种化合物的亲和力与MB327相似(p K i = 4.73±0.03)。值得注意的是,发现新制备的亲脂性4-叔丁基-3-苯基取代的双吡啶鎓盐PTM0022(3 h)具有明显更高的结合亲和力,p Ki值为5.16±0.07,代表在开发更有效的nAChR再敏化剂方面取得了可观的进步。
Disclosed are compounds of Formula 1, including all geometric and stereoisomers, N-oxides, and salts thereof,
wherein
A, B, D, R
1
, R
2
, R
3
, X and m are as defined in the disclosure.
Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling plant disease caused by a fungal pathogen comprising applying an effective amount of a compound or a composition of the invention.
examples of an iron‐catalyzed three‐component synthesis of homoallylic boronates from regioselective union of bis(pinacolato)diboron, an alkenyl halide (bromide, chloride or fluoride), and an olefin are disclosed. Products that bear tertiary or quaternary carbon centers could be generated in up to 87 % yield as single regioisomers with complete retention of the olefin stereochemistry. With cyclopropylidene‐containing
作者:Dominik Gärtner、André Luiz Stein、Sabine Grupe、Johannes Arp、Axel Jacobi von Wangelin
DOI:10.1002/anie.201504524
日期:2015.9.1
unreactive in cross‐coupling reactions which mostly employ more electrophilic halides or activated esters (triflates, tosylates). Acetates are cheap and easily accessible electrophiles but have not been used in cross‐couplings because the strong CO bond and high propensity to engage in unwanted acetylation and deprotonation. Reported herein is a selective iron‐catalyzedcross‐coupling of diverse alkenyl
Photo-induced oxidative cleavage of C–C double bonds for the synthesis of biaryl methanone <i>via</i> CeCl<sub>3</sub> catalysis
作者:Pan Xie、Cheng Xue、Dongdong Du、SanShan Shi
DOI:10.1039/d1ob01002f
日期:——
A synergistic Ce/ROH catalytic mechanism is also proposed based on the experimental observations. This protocol should be the first successful Ce-catalyzed photooxidation reaction of olefins with air as the oxidant, which would provide inspiration for the development of novel Ce-catalyzed photochemical synthesis processes.
开发了一种 Ce 催化的策略,通过在室温下光氧化裂解 C-C 双键来生产联芳基甲酮。该反应在空气下进行,表现出高活性和官能团耐受性。基于实验观察,还提出了协同的 Ce/ROH 催化机制。该协议应该是第一个成功的 Ce 催化烯烃以空气为氧化剂的光氧化反应,这将为开发新型 Ce 催化光化学合成工艺提供灵感。
Iron-catalyzed sulfonyl radical formations from sulfonylhydrazides and oxidative addition to alkenes
Generation of sulfonyl radicals from sulfonylhydrazides has been achieved in the presence of a non-toxic iron catalyst and oxygen. The intermolecular addition of resultant sulfonyl radicals to alkenes affords β-hydroxysulfone compounds.