Tris(pentafluorophenyl)borane [B(C6F5)3]-catalyzed Friedel–Crafts reactions of activated arenes and heteroarenes with α-amidosulfones: the synthesis of unsymmetrical triarylmethanes
摘要:
Tris(pentafluorophenyl)borane [B(C6F5)(3)] has found to be an efficient catalyst for Friedel-Crafts reactions between activated arenes or heteroarenes and alpha-amidosulfones. The products undergo further Friedel-Crafts reactions with activated heteroarenes leading to the synthesis of unsymmetrical triarylmethanes. The present synthetic method displayed significant advantages such as low catalyst loading, mild reaction conditions, highly regioselective, high yield, and broad applicability to various substrates. (C) 2011 Elsevier Ltd. All rights reserved.
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
Direct N-sec-Alkylation of Amides by Reaction of α-Halohydroxamates and Sulfonylindoles: An Approach to 3-Indolyl Methanamines
作者:Yuan Chen、Xiaoqiang Guo、Chuang Zhou、Lianmei Chen、Tairan Kang
DOI:10.1055/s-0037-1611754
日期:2019.4
A catalyst-free, base-mediated N-sec-alkylation of amides by reaction of sulfonylindoles and α-halohydroxamates has been developed. The N-sec-alkylation of amidesreaction is based on an intermolecular nucleophilic addition of vinylogous imine with N-(benzyloxy)meth-acrylamide/azaoxyallyl cations formed in situ and represents a simple way to give polyfunctionalized 3-indolyl methanamines in good to
Palladium-Catalyzed Asymmetric Cycloadditions of Vinylcyclopropanes and in Situ Formed Unsaturated Imines: Construction of Structurally and Optically Enriched Spiroindolenines
作者:Ze-Shui Liu、Wen-Ke Li、Tai-Ran Kang、Long He、Quan-Zhong Liu
DOI:10.1021/ol503383x
日期:2015.1.2
vinyl cyclopropane and α,β-unsaturated imines generated in situ from aryl sulfonyl indoles is reported. The reaction proceeds with high diastereoselectivity to provide the optically enriched spirocyclopentane-1,3′-indolenines in up to 74% yield and with up to 97% ee, which contains an all-carbon quaternary center and two tertiary stereocenters. The reaction involves a first conjugateaddition of the