Ning Wang, Ruzhao Chen, Zhe Chen, Weikang Li, Xiuling Wen, Cunyuan Zhao and Zhuofeng Ke
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Alkali ion-controlled chemoselective indolation of allylic alcohols by base catalysis†
Although the transition-metal-catalyzed cascade reaction of allylic alcohols has achieved great success, there are rare selective examples that are catalyzed only by bases. Here, we present an efficient chemoselective catalytic system for the synthesis of valuable γ-indolation phenylpropanol and bis(indolyl)methane derivatives mediated by a transition-metal-free base and tuned through alkali metal ions. This protocol, which is applicable to a wide range of substrates with wide functional group tolerance, can be directly applied to gram-scale reactions and further transfers to useful intermediates. Experimental and theoretical studies have shown that cesium and sodium ions can precisely regulate the different hydrogen migration pathways of allylic alcohols.
期刊介绍:
Organic Chemistry Frontiers is an esteemed journal that publishes high-quality research across the field of organic chemistry. It places a significant emphasis on studies that contribute substantially to the field by introducing new or significantly improved protocols and methodologies. The journal covers a wide array of topics which include, but are not limited to, organic synthesis, the development of synthetic methodologies, catalysis, natural products, functional organic materials, supramolecular and macromolecular chemistry, as well as physical and computational organic chemistry.