Microwave‐assisted reduction of aromatic nitro compounds with novel oxo‐rhenium complexes
作者:Gabriele Grieco、Olivier Blacque
DOI:10.1002/aoc.6452
日期:2022.1
The reduction of several aromatic nitro compounds to amines by means of the two novel catalytic systems ([IMes]2ReOBr3)/PhSiH3 and ([Py]3ReNOBr2)/PhSiH3 under microwave irradiation is here reported. These two systems were able to perform the reduction of nitro groups with higher TON and TOF when compared with previously reported systems based on oxo-rhenium core under standard heating, although they
radical mechanism through the nitroso radical anion. The novel process affords either benzo[c]cinnoline or benzo[c]cinnolineN-oxide, both in high yields, 93% and 91%, respectively. To obtain benzo[c]cinnoline, the reaction is conducted with an alcohol as solvent and an alkoxide as the base, while for benzo[c]cinnolineN-oxide, water is used as solvent with sodium hydroxide as the base. To establish the latter
已经发现并研究了导致苯并[ c ]肉桂醇骨架的新型合成方法。该过程由两个独立的反应组成,第一个是2,2'-二硝基联苯的硝基部分还原,我们认为该过程是通过SET机理进行的,从而得到羟氨基和亚硝基。在接下来的步骤中,环化是在形成-N N-键的情况下进行的。我们认为该过程是通过亚硝基自由基阴离子的自由基机理发生的。该新方法提供了苯并[ c ]肉桂啉或苯并[ c ]肉桂啉N-氧化物,两者的收率均很高,分别为93%和91%。获得苯并[ c在] cinnoline中,反应以醇为溶剂,以醇盐为碱,而对于苯并[ c ] cinnoline N-氧化物,则以水为溶剂,以氢氧化钠为碱。为了建立后一程序,利用统计实验设计和多变量建模来揭示反应的响应面并确定反应的最佳条件。提出了复杂反应机理的建议。在证实该机理的过程中,发现了一种新的脱氧反应,该反应将苯并[ c ] cinnoline N-氧化物转化为苯并[ c
Facile synthesis of 2,2′-dinitrosubstituted biaryls through Cu-catalyzed ligand-free decarboxylative homocoupling of ortho-nitrobenzoic acids
作者:Zhengjiang Fu、Zhaojie Li、Qiheng Xiong、Hu Cai
DOI:10.1039/c5ra07771k
日期:——
A novel waste-free Cu-catalyzed decarboxylative homocoupling of ortho-nitrobenzoic acids with different substituents on the phenyl core has been developed.
作者:Julian S. Kellner-Rogers、Rina Wang、Tristan H. Lambert
DOI:10.1021/acs.orglett.3c04309
日期:2024.2.9
The first platform for oxidative alkyl halide–olefin metathesis is described. The procedure employs diazenes as catalysts, which effect the cyclization of alkenyl alkylhalides to generate cyclic olefins and carbonyl products. The synthesis of phenanthrene, coumarin, and quinolone derivatives is demonstrated as well as the potential to apply this strategy to other electrophiles.
A practical synthesis of variously substituted benzo[c]cinnoline-NN'-dioxides and N-oxides is described, based on the reduction of the appropriate o,o'-dinitrobiphenyl compound with KOH in refluxing 2-propanol.