Yiyang Zhou, Ruizhi Duan, Qing’e Huang, Chunmei Ding* and Can Li*,
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Amino Acid Synthesis through C–N Coupling between α-Ketoacids and Hydroxylamine from Nitrate Reduction
The artificial synthesis of amino acids is an important yet challenging subject. Electrocatalytic C–N coupling from organic acids and nitrogen sources provides an opportunity for this target but with the difficulty of C–N bond formation toward the production of amino acids. Herein, we report the synthesis of amino acids (alanine, glutamic acid, glycine, leucine, valine) from nitrate and α-ketoacids with a hybrid catalyst, cobalt phthalocyanine immobilized on carbon nanotubes (CoPc/CNT). The Faradaic efficiency for alanine production with CoPc/CNT is as high as 61%. The CoPc catalyst integrated with CNTs can catalyze nitrate reduction to hydroxylamine, which is switched from a thermodynamically uphill to a downhill process. The hydroxylamine intermediate attacks the α-carbon of an α-ketoacid to form an oxime. Amino acids are produced by the reduction of oximes catalyzed by CNTs. The bifunctionality of CoPc/CNT steers the tandem catalytic reaction toward the efficient production of amino acids in one pot. This work identifies that enhancing the reduction of nitrate to hydroxylamine is the key to C–N bond formation in amino acid synthesis.
期刊介绍:
ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels.
The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.