Solventless Clay-Promoted Friedel−Crafts Reaction of Indoles with α-Amido Sulfones: Unexpected Synthesis of 3-(1-Arylsulfonylalkyl) Indoles
摘要:
Friedel-Crafts reaction of indoles with alpha-amido sulfones in the presence of montmorillonite K-10 leads unexpectedly to 3-(1-arylsulfonylalkyl) indoles in good yield. The obtained products can be further desulfonylated under reductive or alkylative conditions giving linear and branched 3-substituted indoles.
Reaction of carbon nucleophiles with alkylideneindazolium and alkylideneindolium ions generated from their 3-(1-arylsulfonylalkyl) indazole and indole precursors
Lewis acid promoted elimination of p-toluenesulfinc acid from sulfonyl indazoles and sulfonyl indoles generates the corresponding iminium ion that reacts with allyltin reagents, silyl enol ethers, silyl ketene acetals and electron-rich aromatics leading to functionalized indazole and indole derivatives.
Synthesis of Unsymmetrical Bisindolylmethanes by Reaction of Indolylmagnesium Bromides with Sulfonyl Indoles
作者:Lixia Yuan、Alessandro Palmieri、Marino Petrini
DOI:10.1002/adsc.201901357
日期:2020.4.8
functionalized indole derivatives upon reaction with nucleophiles. In this paper reaction of sulfonyl indoles with indolylmagnesium bromides is used to access unsymmetrical bisindolylmethanes. The target compounds are obtained in satisfactory yields starting from a wide range of substrate/reagent combinations. The utilization of pyrrolylmagnesium bromides for the same reaction also affords the expected adducts
Reaction of 3‐(1‐Arylsulfonylalkyl)‐indoles with Easily Enolisable Derivatives Promoted by Potassium Fluoride on Basic Alumina
作者:Roberto Ballini、Alessandro Palmieri、Marino Petrini、Rafik R. Shaikh
DOI:10.1002/adsc.200700410
日期:2008.1.4
Active methylene compounds and nitro derivatives react with 3-(1-arylsulfonylalkyl)-indoles in the presence of potassiumfluoride on basic alumina at room temperature leading to the corresponding adducts in good yields. Under basic conditions, sulfonylindoles suffer elimination of arenesulfinic acid leading to an intermediate vinylogous imine that promptly adds stabilized carbanions. The obtained 3-indolyl
The rhodium-catalyzed addition of arylboronic acids to vinylogous imines generated in situ from sulfonylindoles has been developed. This procedure provided a rapid approach to C-3 sec-alkyl-substituted indoles.
A convenient approach to 3-sec-alkyl substituted indoles was developed via palladium-catalyzed addition of arylboronic acids to vinylogousiminesgenerated in situfrom sulfonylindoles under mild conditions.