Herein, we report a direct method for the synthesis of α-imidoketones and α-azolylketones via hypoiodite-catalyzed oxidative α-C−N coupling of ketones with the corresponding imides and azoles, respectively. The use of inorganic base additives such as cesium carbonate in the presence of 18-crown-6 as a phase transfer catalyst was crucial to induce high reactivity. Control experiments revealed that the
New Reactions of IBX: Oxidation of Nitrogen- and Sulfur-Containing Substrates To Afford Useful Synthetic Intermediates
作者:K. C. Nicolaou、Casey J. N. Mathison、Tamsyn Montagnon
DOI:10.1002/anie.200352076
日期:2003.9.5
Iodine(V) Reagents in Organic Synthesis. Part 4. <i>o</i>-Iodoxybenzoic Acid as a Chemospecific Tool for Single Electron Transfer-Based Oxidation Processes
作者:K. C. Nicolaou、T. Montagnon、P. S. Baran、Y.-L. Zhong
DOI:10.1021/ja012127+
日期:2002.3.1
o-Iodoxybenzoic acid (IBX), a readily available hypervalent iodine(V) reagent, was found to be highly effective in carrying out oxidations adjacent to carbonyl functionalities (to form alpha,beta-unsaturated carbonyl compounds) and at benzylic and related carbon centers (to form conjugated aromatic carbonyl systems). Mechanistic investigations led to the conclusion that these new reactions are initiated