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 tributyltinhydride 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。
N-Alkoxyimidoyl Bromides as a New and Efficient Coupling Partner in Pd-Catalyzed Stille Reaction
作者:Sukbok Chang、Myunghee Lee、Sunggak Kim
DOI:10.1055/s-2001-17480
日期:——
N-Alkoxyimidoyl bromides have been successfully employed as an efficient organic partner in the Pd-catalyzed Stille coupling reaction with various organotin compounds, and the corresponding O-alkyloximes were obtained in good to excellent yields.
A direct acetylation of inert C(sp3)–H bonds was developed that was catalyzed by decatungstate under visible light irradiation and was followed by radical addition–disassociation with phenylsulfonyl ethanone oxime. The reaction displays site-selectivity in multiple C(sp3)–H bonds without prefunctionalization and directing groups. Various functional groups are well-tolerated and natural molecules are