Iron-catalyzed Minisci acylation of N-heteroarenes with α-keto acids
作者:Xiu-Zhi Wang、Cheng-Chu Zeng
DOI:10.1016/j.tet.2019.01.060
日期:2019.3
protocol has been developed for the Minisci acylation reactions of nitrogen-containing heteroarenes with α-keto acids. Distinct from the conventional Minisci acylation conditions, the chemistry was performed using non-noble metal Fe(II), instead of expensive Ag(I) salt, as catalyst. A wide range of substrates, including aliphatic or aromatic α-keto acids, as well as various N-heteroarenes, proved to
A New, Convenient Synthesis of Monoaroylpyrazines via Homolytic Substitution
作者:G. Heinisch、G. Lötsch
DOI:10.1055/s-1988-27484
日期:——
Reactions of 2-pyrazinecarboxylic acid (1) with aroyl radicals to give 5-aroyl-2-pyrazinecarboxylic acids 3 followed by decarboxylation provide convenient access to aryl 2-pyrazinyl ketones (2-aroylpyrazines) 4.
Analogues of Fenarimol Are Potent Inhibitors of Trypanosoma cruzi and Are Efficacious in a Murine Model of Chagas Disease
作者:Martine Keenan、Michael J. Abbott、Paul W. Alexander、Tanya Armstrong、Wayne M. Best、Bradley Berven、Adriana Botero、Jason H. Chaplin、Susan A. Charman、Eric Chatelain、Thomas W. von Geldern、Maria Kerfoot、Andrea Khong、Tien Nguyen、Joshua D. McManus、Julia Morizzi、Eileen Ryan、Ivan Scandale、R. Andrew Thompson、Sen Z. Wang、Karen L. White
DOI:10.1021/jm2015809
日期:2012.5.10
We report the discovery of nontoxic fungicide fenarimol (1) as an inhibitor of Trypanosoma cruzi (T. cruzi), the causative agent of Chagas disease, and the results of structure-activity investigations leading to potent analogues with low nM IC(50)s in a T. cruzi whole cell in vitro assay. Lead compounds suppressed blood parasitemia to virtually undetectable levels after once daily oral dosing in mouse models of T. cruzi infection. Compounds are chemically tractable, allowing rapid optimization of target biological activity and drug characteristics. Chemical and biological studies undertaken in the development of the fenarimol series toward the goal of delivering a new drug candidate for Chagas disease are reported.
A New Cyclization to Fused Pyrazoles Tunable for Pericyclic or Pseudopericyclic Route: An Experimental and Theoretical Study
作者:László Filák、Tibor András Rokob、Gyöngyvér Ágnes Vaskó、Orsolya Egyed、Ágnes Gömöry、Zsuzsanna Riedl、György Hajós
DOI:10.1021/jo800483a
日期:2008.5.1
2-Pyrazinyl (2) and 3-pyridazinylketone arylhydrazones (6) and their benzologues undergo a ring closure reaction to yield pyrazolo[3,4-b]pyrazines (4) and pyrazolo[4,3-c]pyridazines (7), respectively, in acceptable to good yields. The reaction was found to be accelerated by using acidic or basic conditions. Quantum chemical calculations suggest the key step of the mechanism to be a direct cyclization; analysis of aromaticity based on computed magnetic properties revealed its medium-dependent pericyclic or pseudopericyclic character. The cyclization reaction has also been extended for the synthesis of related ring systems (9, 12, 14).