Mechanically Induced Fe(III) Catalysis at Room Temperature: Solvent-Free Cross-Dehydrogenative Coupling of 3-Benzylic Indoles with Methylenes/Indoles
作者:Jing-Bo Yu、Yang Zhang、Zhi-Jiang Jiang、Wei-Ke Su
DOI:10.1021/acs.joc.6b02197
日期:2016.11.18
An Fe(III)-catalyzed solvent-free cross-dehydrogenativecoupling of 3-benzylic indoles and compounds with acidic methylene groups has been achieved under high-speed ball-milling (HSBM) conditions at roomtemperature. The reactions afford desired 3-arylmethylindole derivatives in moderate to high yields within 21 min of grinding. Besides, both N-substituted and N-free indoles can take part in this mechanochemical
Reduction of 3-(1-arylsulfonylalkyl) indoles (sulfonylindoles) using polymer-supported sodium borohydride underflowchemicalconditions allows an efficient synthesis of 3-alkylindoles with a notable waste minimization and reduced solvent consumption. The flowconditions can be also applied to the synthesis of sulfonylindoles which can be obtained by a three-component coupling of indoles with aldehydes
Mechanochemical Asymmetric Cross‐Dehydrogenative Coupling Reaction: Liquid‐Assisted Grinding Enables Reaction Acceleration and Enantioselectivity Control
作者:Jingbo Yu、Ping Ying、Hao Wang、Keyu Xiang、Weike Su
DOI:10.1002/adsc.201901363
日期:2020.2.21
We report here a mechanochemical protocol for asymmetric cross‐dehydrogenative coupling (CDC) reaction of unreactive 3‐arylmethyl indoles with 1,3‐dicarbonyl by liquid‐assisted grinding. Small drops of liquid additive n‐butyl acetate (n‐BuOAc) are key to achieve high yield and enantioselectivity in this transformation. The catalyst can be lowered to 5 mol% and reused for three times. Pharmaceutical
Friedel-Crafts alkylation of indoles with trichloroacetimidates
作者:Tamie Suzuki、John D. Chisholm
DOI:10.1016/j.tetlet.2019.04.007
日期:2019.5
regularly possess significant pharmacological activity. Therefore the development of simple, inexpensive and efficient methods for alkylating the indole heterocycle continues to be an active research area. Reported are reactions of trichloroacetimidate electrophiles and indoles to address the challenges of accessing alkyl decorated indole structures. These alkylations perform best when either the indole