Electrophilic Allylations and Benzylations of Indoles in Neutral Aqueous or Alcoholic Solutions
作者:Martin Westermaier、Herbert Mayr
DOI:10.1021/ol0618555
日期:2006.10.1
[reaction: see text] Indoles are allylated and benzylated in moderate to quantitative yield when stirred with allyl and benzyl halides in 80% aqueous acetone in the presence of NH(4)HCO(3) at room temperature.
Stable Bromiranium Ion Salts as Reagents for Biomimetic Indole Terpenoid Cyclizations
作者:Jonathan Bock、Constantin G. Daniliuc、Ulrich Hennecke
DOI:10.1021/acs.orglett.9b00259
日期:2019.3.15
Indole terpene alkaloids are a diverse group of natural products and show significant biological activities. To enable their biomimetic synthesis, electrophilic bromocyclization of polyenyl indole derivatives could be achieved using sterically demanding bromiranium ion salts with the weakly coordinating counterion BArF– as reagent. Starting from polyenyl indole derivatives, the corresponding bromocyclization
The reaction of 3-substituted indoles with dehydroalanine (Dha) derivatives under Lewis acid-mediated conditions has been investigated. The formation of 2-substituted tryptophans is proposed to occur through a selective alkylative dearomatization-cyclization followed by C3- to C2-alkyl migration and rearomatization.
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.