Synthesis of Cyclopropane-Containing Phosphorus Compounds by Radical Coupling of Butenylindium with Iodo Phosphorus Compounds
作者:Kensuke Kiyokawa、Itaru Suzuki、Makoto Yasuda、Akio Baba
DOI:10.1002/ejoc.201001471
日期:2011.4
by-product to be inert to the reaction system. In addition, the transmetalation of a (cyclopropylmethyl)stannane and InBr3 provided the dibutenylindium bromide as a single product, which smoothly coupled with the unstable phosphonyl radical species from the iodo phosphorus compound. A photochemical method (UV irradiation) was also applied and accelerated the coupling reaction. The cyclopropylmethylated
通过(环丙基甲基)锡烷和 InBr3 之间的金属转移反应制备的 α-或 β-碘代磷化合物(如碘膦酸酯、碘代膦氧化物和碘代硫代膦酸酯)与丁烯基的自由基偶联,得到相应的环丙基甲基化产物。自由基反应是由丁烯基铟产生的自由基物种在少量氧气的辅助下引发的。Butenylindium 不仅可用作环丙基甲基化试剂,还可用作自由基引发剂。为了成功偶联,使用了锡/铟金属转移,其中卤化锡副产物对反应系统呈惰性非常重要。此外,(环丙基甲基)锡烷和 InBr3 的金属转移提供了二丁烯基溴化铟作为单一产品,其与来自碘磷化合物的不稳定膦酰基物种顺利偶联。还应用了光化学方法(紫外线照射)并加速了偶联反应。产生的环丙基甲基化膦酸酯是 Horner-Wadsworth-Emmons 反应的良好中间体,并产生带有环丙烷部分的官能化烯烃。