作者:Santosh V. Shelar、Narshinha P. Argade
DOI:10.1039/c9ob00764d
日期:——
Facile regioselective oxidation of indoles to 2-oxindoles promoted by sulfuric acid adsorbed on silica gel is reported. The demonstrated practical site-selective heterogeneous oxidation reactions conveniently take place with a broad substrate scope and functional group tolerances. The present oxidation strategy is also employed to accomplish the total synthesis of natural products donaxaridine and
据报道,通过硫酸吸附在硅胶上,吲哚易于区域选择性氧化为2-羟吲哚。在广泛的底物范围和官能团耐受性的情况下,已证明的实用的现场选择性非均相氧化反应可以方便地进行。本发明的氧化策略也被用来完成天然产物多那西啶和多那沙林的全合成。根据分析和光谱数据,证明多纳沙林与其水合开环形式保持平衡。简要讨论了这种类型的氧化必不可少的结构特征和合理的机理。