Copper‐Catalyzed Addition of Grignard Reagents to in situ Generated Indole‐Derived Vinylogous Imines
作者:Luo Ge、Mercedes Zurro、Syuzanna R. Harutyunyan
DOI:10.1002/chem.202004232
日期:2020.12.9
Herein, the first protocol for catalytic asymmetric conjugateaddition of Grignard reagents to various sulfonyl indoles, offering a straightforward approach for the synthesis of chiral 3‐sec‐alkyl‐substituted indoles in high yields and enantiomeric ratios is presented. This methodology makes use of a chiral catalyst based on copper phosphoramidite complexes and in situ formation of vinylogous imine
Reaction of sulfonylindoles with protected β-nitro ketones affords the corresponding 3-(2-nitroalkyl)indoles that, under acidic conditions, undergo a sequence of cascade processes finally leading to unsymmetrical1,4-disubstitutedcarbazoles.
InBr<sub>3</sub>: A Versatile Catalyst for the Different Types of Friedel−Crafts Reactions
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1021/jo9014613
日期:2009.10.16
Mild and efficient InBr3-catalyzed Friedel−Crafts alkylation of heteroaromatic or electron-rich aromatic compounds with α-amido sulfones at room temperature in CH2Cl2 has been developed. The products undergo further Friedel−Crafts alkylation with heteroaromatic or electron-rich aromatic compounds leading to unsymmetrical or bis-symmetrical triaryl methanes in good yield. α-Amido sulfones are employed
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