Cyclization and oxidation of o -bromophenylacetamides for the synthesis of oxindoles and isoindigoes
作者:Liang Liu、Lei Song、Yujun Guo、Dewen Min、Tianchao Shi、Wu Zhang
DOI:10.1016/j.tet.2017.12.005
日期:2018.1
N-substituted oxindoles were obtained through a facile KOH/DMSO promoted intramolecular cyclization of o-bromophenylacetamides in good yields. Furthermore, isoindigo derivatives were readily synthesized through sequential intramolecular cyclization, oxidation and condensation of o-bromophenylacetamide in the presence of copper (II) acetate monohydrate, iodobenzene diacetate and KOH/DMSO. This method
通过容易的KOH / DMSO促进邻溴苯基乙酰胺的分子内环化以良好的产率获得N-取代的羟吲哚。此外,在乙酸铜(II)一水合物,碘代苯二乙酸盐和KOH / DMSO的存在下,通过依次的邻溴苯基乙酰胺的分子内环化,氧化和缩合,可以容易地合成异靛蓝衍生物。该方法使用邻-溴苯基乙酰胺作为唯一原料,可以方便地合成一系列羟吲哚和对称的生物学上重要的(E)-双吲哚-2-酮。根据对照实验结果阐明了反应机理。