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.
Ruthenium Pincer Complex Catalyzed Selective Synthesis of C‐3 Alkylated Indoles and Bisindolylmethanes Directly from Indoles and Alcohols
作者:Nandita Biswas、Rahul Sharma、Dipankar Srimani
DOI:10.1002/adsc.202000326
日期:2020.7.29
catalyst for C‐3 alkylation of 1H‐indoles with various aliphatic primary and secondary alcohols including cyclic alcohols as well as benzylic alcohols. The selective synthesis of bisindolylmethane derivatives is also achieved from the same set of indole and alcohol just by altering the reaction parameters. Furthermore, the sustainable synthesis of C‐3 alkylated indoles directly from 2‐(2‐nitrophenyl)ethan‐1‐ol
This report describes a palladium-catalyzed dearomatization and amination tandem reaction of 2,3-disubstituted indoles and benzofurans via the Catellani strategy. This reaction provides a new method for the construction of amino-substituted indoline-fused cyclic and benzofuran spiro compounds in good yields. The reaction has broad functional group compatibility and substrate scope.
Lend me your hydrogen! The first transition‐metal‐catalyzed alkylations of indoles with aliphatic amines proceeding under transfer hydrogenation conditions are developed (see scheme). This reaction is based on the borrowing hydrogen methodology.
An efficient route to 2,3-disubstituted indoles was developed via reductive alkylation of 2-substitutedindoles using hydrogen as a clean and atom economic reductant under ambient pressure.
the development of sequential catalytic processes. Herein, the discovery of an anthraquinone‐catalyzed thermal indole‐C3‐alkylation with benzylamines is described, which can be combined sequentially with a new visible‐light‐driven catalytic photooxidation/1,2‐shift reaction. The one‐flask tandem process converts indoles into 3‐benzylindole intermediates, which are further transformed into new fluorescent