Synthesis of α-Nitroketones through Electrochemical Olefin Oxidation–Nitration

Abstract

α-Nitroketones represent an important class of organic compounds in synthetic chemistry because of the synergistic interaction between their adjacent carbonyl and nitro functional groups. However, current reporting methods often pose environmental concerns and require harsh reaction conditions, such as the use of noble metal catalysts and external oxidants. Herein, we report a novel and environmentally benign electrochemical bifunctional groups strategy for the efficient synthesis of α-nitroketones directly from olefins. This approach is based on a dual-source system, in which Fe(NO₃)₃·9H₂O serves as a versatile precursor, simultaneously supplying the nitro group, while trace amounts of water inherently present in the electrolyte act as the oxygen source for carbonyl formation. This tandem oxidation–nitration process enables the direct construction of the valuable α-nitroketone scaffold from simple starting materials in a single operational step. A primary advantage of this methodology lies in its inherently green and sustainable nature. Compared with conventional methods, this strategy markedly decreases the necessity of using hazardous and volatile nitromethane as a nitro source and avoids the routine application of stoichiometric condensation or oxidizing agents that tend to produce large quantities of chemical waste. Instead, electricity functions as a traceless redox agent, driving the transformation under mild conditions—generally at room temperature or with minimal heating and under ambient pressure. This leads to a significantly reduced environmental footprint and enhances operational safety. The reaction demonstrates remarkable synthetic utility, characterized by a broad substrate scope. A wide variety of olefins, including those bearing aryl, aliphatic, and heterocyclic substituents, are smoothly converted into the corresponding α-nitroketones in moderate to good yields. In summary, we have developed a mild, efficient, and sustainable electrochemical route to α-nitroketones. By integrating atom-economic principles with the advantages of electrosynthesis—including inherent safety and scalability—this work provides a powerful and practical alternative to conventional methods, aligning with the growing demands of modern green chemistry.

Keywords

Electrochemistry / Olefins / Water / Iron(III) nitrate / Bifunctional groups / Oxidation–nitration / α-Nitroketones / Green chemistry / Sustainable chemistry

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