Synthesis of novel ferrocenyl-containing pyrazolo[4,3-c]quinolines
作者:Günseli Turgut Cin、Seda Demirel、Abban Cakici
DOI:10.1016/j.jorganchem.2010.10.006
日期:2011.1
Synthesis of novel ferrocenyl-substituted pyrazolo[4,3-c]quinolines via the Pictet–Spengler reaction is reported. Iminium intermediate formed by the condensation of pyrazole-based arylamine substrates with ferrocenecarboxaldehyde in acidic medium, undergoes 6-endo cyclization with sufficiently reactive aromatic moiety to form a pyrazolo[4,3-c]quinoline ring.
Photooxidation of various 2-pyrazolines is studied experimentally and computationally. Experimental results show that the electron-donating/withdrawing substituents increases/decreases the rate of this photoreaction. The proposed light-induced electron-transfer mechanism explains the steric and electronic effects of the substituents, co-planarity of the aryl rings substitutions, orientations of the
实验和计算研究了各种2-吡唑啉的光氧化作用。实验结果表明,给电子/吸电子取代基增加/降低了这种光反应的速率。拟议的光诱导电子转移机理解释了取代基的空间和电子效应,芳基环取代基的共面性,C 3-芳基环向C 3 = N 2的方向双键与溶剂在照射时间上反应完全。计算(TD)B3LYP / 6-311 ++ G(d,p)结果,包括前沿轨道能量,UV-可见跃迁,静电势,CHELPG电荷,用于发现和描述隧道电子转移过程及其相关结构弛豫形成反应的速率决定步骤,并证明取代对反应速率的影响是正确的。第一次电子转移后形成的中间体络合物仅在其三重态下才进行质子转移步骤。2-吡唑啉的三重态激发态可能对电子转移步骤几乎没有贡献。循环伏安法测量结果支持了光化学结果。
Ethylenimine Ketones. XII. Stereoisomerism of 1-Cyclohexyl-2-(o-nitrophenyl)-3-benzoylethylenimine. Quinoline Syntheses
作者:Norman H. Cromwell、Gerald D. Mercer
DOI:10.1021/ja01571a052
日期:1957.7
A convenient and efficient protocol for the synthesis of 5-aryl-1,3-diphenylpyrazole catalyzed by hydrochloric acid under ultrasound irradiation
作者:Ji-Tai Li、Ying Yin、Ling Li、Ming-Xuan Sun
DOI:10.1016/j.ultsonch.2009.06.015
日期:2010.1
The synthesis of 5-aryl-1,3-diphenylpyrazole via the reactions of 3-aryl-2,3-epoxy-1-phenyl-1-propanone with phenylhydrazine was carried out in 69-99% yields at room temperature under ultrasound irradiation. This method provides several advantages such as operational simplicity, higher yield and environment friendly. (C) 2009 Elsevier B.V. All rights reserved.
Epoxyketones. III.<sup>1</sup> Stereochemistry of cis- and trans-o-Nitrobenzalacetophenone Oxide