Regiodivergent Aromatic Electrophilic Substitution Using Nitrosoarenes in Hexafluoroisopropanol: A Gateway for Diarylamines and
<i>p</i>
‐Iminoquinones Synthesis
A metal‐free aromatic electrophilic substitution reaction using nitrosoarenes as the electrophile in 1,1,1,3,3,3‐hexafluoroisopropanol (HFIP) is reported. HFIP activates nitrosoarene towards the electrophilic C−H amination followed by a concomitant N−O bond cleavage to deliver diarylamines without requiring any extra reagent or further treatment. The dual electrophilic nature of nitrosoarene permits
one-pot biarylamination of quinones with arylamines was developed to synthesize N-arylamine-functionalized p-iminoquinones derivatives. The approach employed AgOAc as the catalyst and (NH4)2S2O8 as the oxidant in the presence of 3-chlorophenylboronic acid, giving a series of N-arylamine-functionalized p-iminoquinone derivatives in moderate to good yields whereas reaction in the absence of the 3-chlorophenylboronic
开发了醌与芳胺的简明一锅二芳基化合成N-芳胺功能化的对亚氨基醌衍生物。该方法在 3-氯苯基硼酸存在下使用 AgOAc 作为催化剂,使用 (NH 4 ) 2 S 2 O 8作为氧化剂,以中等至良好的收率得到一系列N-芳胺官能化的对亚氨基醌衍生物,而反应在不存在 3-氯苯基硼酸,得到一系列N-芳胺官能化的 1,4-萘醌衍生物。这种催化方法代表了醌双官能化的分步经济且方便的策略。
Substrate‐Dependent Divergent Oxyamination of <i>beta</i>‐Tetralones Enabling Modular Synthesis of 2‐Amino‐<i>para</i>‐Iminonaphthoquinones and 4‐Amino‐1,2‐Naphthoquinone Derivatives
作者:Shuowen Wang、Rong Li、Huawen Huang、Guojiang Mao、Wen Shao、Guo‐Jun Deng
DOI:10.1002/adsc.202300138
日期:2023.5.12
A regioselective synthesis of 2-amino-para-iminonaphthoquinones and 4-amino-1,2-naphthoquinones was described via the substrate-dependent divergent multi-functionalization of β-tetralone with primary and secondary amines under metal-free conditions. This developed strategy features extremely green and mild conditions (O2 as oxidant, ethanol as solvent under ambient temperature), broad substrate scope