reacts with tosyl cyanide to afford the corresponding nitrile in a highly efficient manner. The present methodology is widely applicable to various starting materials including ethers, alcohols, amine derivatives, alkanes, and alkylbenzenes. This newly developed C–H cyanation protocol provides a powerful tool for selective one-carbon elongation for the construction of architecturally complex molecules
Decarboxylative Alkynylation and Cyanation of Carboxylic Acids using Photoredox Catalysis and Hypervalent Iodine Reagents
作者:Franck Le Vaillant、Jérôme Waser
DOI:10.2533/chimia.2017.226
日期:——
in material and medicinal sciences. A convenient and straightforward access to both classes of compounds under mild conditions is, therefore, highly desirable. Herein, we disclose the decarboxylative alkynylation and cyanation of broadly available carboxylic acids using photoredox catalysis and hypervalent iodine reagents. Choices of both catalysts and reagents were crucial. Computational and experimental
Room temperature decarboxylative cyanation of carboxylic acids using photoredox catalysis and cyanobenziodoxolones: a divergent mechanism compared to alkynylation
作者:Franck Le Vaillant、Matthew D. Wodrich、Jérôme Waser
DOI:10.1039/c6sc04907a
日期:——
The one-step conversion of aliphatic carboxylicacids to the corresponding nitriles has been accomplished via the merger of visible light mediated photoredox and cyanobenziodoxolones (CBX) reagents. The reaction proceeded in high yields with natural and non-natural α-amino and α-oxy acids, affording a broad scope of nitriles with excellent tolerance of the substituents in the α position. The direct
Paired Electrolysis for Decarboxylative Cyanation: 4-CN-Pyridine, a Versatile Nitrile Source
作者:Gadde Sathish Kumar、Prashant S. Shinde、Haifeng Chen、Krishnamoorthy Muralirajan、Rajesh Kancherla、Magnus Rueping
DOI:10.1021/acs.orglett.2c01897
日期:2022.9.9
decarboxylative cyanation of amino acids under paired electrochemical reaction conditions has been developed. 4-CN-pyridine was found to be a new and effective cyanation reagent undercatalyst-freeconditions. Mechanistic studies support a nucleophilic reaction pathway, and the cyanation protocol can be applied to diverse substrates including N,N-dialkyl aniline and indole derivatives.
Synthesis of N-Boc-protected alpha-aminonitriles starting from N-Boc-protected alpha-aminosulfones is described. Treatment of the sulfone with two equivalents of potassium cyanide in 2-propanol or dichloromethane-H2O under phase transfer condition affords crystalline N-Boc-protected alpha-aminonitriles in good yield. Hydrolysis of the aminonitriles provides a convenient access to racemic a-amino acids.