Generation of Aryl Radicals through Reduction of Hypervalent Iodine(III) Compounds with TEMPONa: Radical Alkene Oxyarylation
作者:Marcel Hartmann、Yi Li、Christian Mück-Lichtenfeld、Armido Studer
DOI:10.1002/chem.201504852
日期:2016.3.1
A novel method for selective generation of aryl radicals from diaryliodonium salts and iodanylidene malonates with sodium 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPONa) as a single‐electron transfer (SET) reducing reagent is described. In the presence of various alkenes, aryl radicals formed after SET‐reduction of hypervalent iodine compounds undergo alkene addition and the adduct radicals that are
描述了一种新的方法,该方法可以用二,2,6,6-四甲基哌啶-1-氧基钠(TEMPONa)作为单电子转移(SET)还原剂,从二芳基碘鎓盐和碘丙二酸丙二酸酯中选择性生成芳基。在存在各种烯烃的情况下,高价碘化合物经SET还原后形成的芳基会经历烯烃加成反应,由此产生的加成基会被伴随产生的TEMPO自由基有效地捕获,最终以中等至非常好的收率提供氧化酰化产物。研究了各种碘(III)试剂的芳基自由基生成效率,并且还通过计算方法研究了碘亚烷基丙二酸酯芳基自由基的生成。