Directed Oxidative Cyclizations to C2- or C4-Positions of Indole: Efficient Construction of the Bicyclo[4.3.1]Decane Core of Welwitindolinones
作者:Vikram Bhat、James A. MacKay、Viresh H. Rawal
DOI:10.1021/ol201122f
日期:2011.6.17
propensity for cyclization at the 2-position of indole so as to favor the 4-position, enabling the construction of the unique framework found in most welwitindolinone alkaloids. The chloride functions here as more than a blocking group, as it also provides ready access to the corresponding oxindole.
3-取代吲哚的区域控制氧化环化在本文中描述。具体而言,表明在 C2 上安装氯化物改变了吲哚 2 位环化的固有倾向,从而有利于 4 位,从而能够构建在大多数 welwitindolinone 生物碱中发现的独特框架。氯化物在这里的作用不仅仅是一个封闭基团,因为它还提供了对相应羟吲哚的快速访问。