Solid-phase synthesis of indol-2-ones (2-oxindoles) by means of aryl radical cyclization of resin-bound N-(2-bromophenyl)acrylamides using Bu3SnH is described. Among various solvents tested, DMF was found to be the best choice for the radical cyclization inducing a reagent concentration effect of the polymer support. The reaction proceeded smoothly under microwave irradiation to give the desired indol-2-ones within a very short reaction time in comparison to conventional thermal heating. In this reaction, various indol-2-ones were synthesized by using commercially available 2-bromoanilines and acryloyl chloride derivatives.
描述了一种通过使用Bu3SnH对
树脂结合的N-(2-
溴苯基)
丙烯酰胺进行芳基自由基环化,从而实现Indol-2-酮(2-氧
喹啉)的固相合成。在测试的各种溶剂中,
DMF被认为是自由基环化的最佳选择,能够引发聚合物支撑的试剂浓度效应。在微波辐射下,反应顺利进行,与传统的热加热相比,在极短的反应时间内获得所需的Indol-2-酮。在此反应中,使用商业可得的
2-溴苯胺和
丙烯酰氯衍
生物合成了多种Indol-2-酮。