Direct Thioamination of Arynes via Reaction with Sulfilimines and Migratory N-Arylation
摘要:
A novel method for preparing a diverse range of o-sulfanylanilines is described. Direct thioamination of arynes with sulfilimines gives o-sulfanylanilines, involving C-N and C-S bond formations and migratory N-arylation.
Similar intermolecular cyclization reactions, however, are scarcer for nitrogenbuildingblocks, including N-centred radicals, and divergent and modular versions are not established. Here we report the use of sulfilimines as bifunctional N-radical precursors for cyclization reactions with alkenes to produce N-unprotected heterocycles in a single step through photoredox catalysis. Structurally diverse
含氮分子在烯烃侧链上的分子内环化是构建 N-杂环的有效策略,这在药物和材料等领域至关重要。然而,对于氮结构单元(包括以 N 为中心的自由基)来说,类似的分子间环化反应较少,并且尚未建立发散和模块化版本。在这里,我们报道了使用硫亚胺作为双功能N-自由基前体与烯烃进行环化反应,通过光氧化还原催化一步生成N-未保护的杂环。结构多样的硫亚胺可以一步合成,然后与烯烃结合,得到具有合成价值的五元、六元和七元杂环。通过试剂的双功能特性实现的自由基-极性交叉环化可以实现广泛而多样化的范围,这与所有其他基于 N 中心自由基的反应不同。与目前其他单一环化方法相比,硫亚胺的模块化合成允许 N-杂环产物具有更大的结构多样性。
Migrative Thioamination of Aryne Intermediates Generated from o-Iodoaryl Triflates
takes place using various o-iodoaryl triflates and sulfilimines. The selective migration realizes the facile synthesis of a broad range of highly functionalized o-thioaminated diaryl sulfides. We succeeded in the ring expansion of cyclic sulfilimines enabling us to prepare eight- and nine-membered organosulfurs from dibenzothiophene- and thianthrene-type sulfilimines, respectively.
Electrochemical <i>N</i>-acylation and <i>N</i>-α-ketoacylation of sulfoximines <i>via</i> the selective decarboxylation and dehydration of α-ketoacids
作者:Chen Kang、Mingzhe Li、Wenxiu Huang、Shoucai Wang、Mengyu Peng、Longqiang Zhao、Guangbin Jiang、Fanghua Ji
DOI:10.1039/d3gc02674d
日期:——
compounds. However, limited reports exist for their selective functionalization via green and efficient protocols. Herein, we describe an electrochemical N-acylation and N-α-ketoacylation of sulfoximines via the selective decarboxylation and dehydration of α-ketoacids. These two reactions use electricity as a “traceless” oxidant and α-ketoacid as a selective “acyl” or “α-ketoacyl” source. A broad range of
Iron(II)-Catalyzed Direct Synthesis of NH Sulfoximines from Sulfoxides
作者:Hao Yu、Zhen Li、Carsten Bolm
DOI:10.1002/anie.201710498
日期:2018.1.2
Free NH‐sulfoximines were directly prepared from sulfoxides through iron catalysis by applying a readily available, shelf‐stable hydroxylamine triflic acid salt. No additional oxidant is needed, and the substrate scope is broad, including a range of heterocyclic compounds.
A novel method for preparing a diverse range of o-sulfanylanilines is described. Direct thioamination of arynes with sulfilimines gives o-sulfanylanilines, involving C-N and C-S bond formations and migratory N-arylation.