Regioselective Synthesis of 3-Alkylindoles Mediated by Zinc Triflate
摘要:
Zinc triflate was found to be an effective reagent for the C3-alkylation of indoles by alkyl halides in the presence of Hunig's base and tetrabutylammonium iodide. This new method for indole alkylation proceeds by a S(N)1-like pathway, and is general for allylic, benzylic, and tertiary halides.
The basic industrial feedstock isoprene was employed as a building block to install prenyl and reverse‐prenyl groups onto indoles. The regioselectivity can be manipulated by the choice of metal hydride. Reverse‐prenylated indoles were attained with high selectivity when using Rh−H. By switching to a Pd−H catalyst, selectivity toward prenylated indoles was achieved. This regiodivergent method also features
Regioselective Synthesis of 3-Alkylindoles Mediated by Zinc Triflate
作者:Xiuwen Zhu、A. Ganesan
DOI:10.1021/jo010996b
日期:2002.4.1
Zinc triflate was found to be an effective reagent for the C3-alkylation of indoles by alkyl halides in the presence of Hunig's base and tetrabutylammonium iodide. This new method for indole alkylation proceeds by a S(N)1-like pathway, and is general for allylic, benzylic, and tertiary halides.