Highly Efficient Formation of Nitriles and Alkoxy Radicals from <i>N</i>-Alkoxybenziminoyl Chlorides in Solution
作者:H. J. Peter de Lijser、Cassandra R. Burke、Jonathan Rosenberg、Jordan Hunter
DOI:10.1021/jo8026142
日期:2009.2.20
N-alkoxybenziminoyl chlorides were synthesized and reacted with tributyltin hydride in the presence of AIBN to generate the corresponding N-alkoxybenziminoyl radicals. This methodology successfully generates the desired radicals, which undergo a rapid and highly efficient β-scission reaction, as shown by the formation of the corresponding nitriles and products derived from alkoxy radicals. The intermediate N-alkoxybenziminoyl
合成了一系列的N-烷氧基苯甲酰氯,并在AIBN的存在下与氢化三丁基锡反应生成相应的N-烷氧基苯甲酰氨基。这种方法成功地生成了所需的自由基,这些自由基经历了快速,高效的β-断裂反应,这是通过形成相应的腈和衍生自烷氧基的产物所表明的。通过使用高浓度的Bu 3 SnH或通过使用氢原子给体溶剂(例如甲苯),不能捕获中间的N-烷氧基苯并氨基自由基。发现快速的β-断裂反应与亚氨酰氯的结构无关。这些结果不同于类似的研究N-烷基亚氨基自由基,通常从两个β-断裂氢原子转移途径产生产物。从这项研究中,以及一些报道速率常数不同的氢原子转移(HAT)的过程中的数据,我们得出结论,用于速率常数β-断链过程(下限ķ β中)Ñ -alkoxybenziminoyl自由基是2.5 ×10 7 s -1。