Copper-catalyzed three-component redox-neutral ring opening of benzothiazoles with aryl iodides and O-benzoyl hydroxylamines for the synthesis of 1-amino-N-(2-(phenylthio)phenyl)methanimine has been developed. This one-pot reaction undergoes C–S and N–O bond cleavage and new C–S and C–N bond construction. Several control experiments excluded a free radical procedure and also demonstrated the secondary
studies have revealed that anodicoxidation of H-phosphorus compounds occurs first to generate the key P-centered radical directly and cathodic reduction leads to the concurrent release of molecular hydrogen or methane. This protocol features simple operation, broad substrate scope, clean and mild conditions, and atom and step economy to form heterocycle-containing organophosphorus scaffolds.
公开了一种电触发级联环化策略,同时伴随次膦酰化和N-杂环构建。它提供了一种新颖且环保的方法来获得氧膦基取代的N -杂环,无需外部金属催化剂、氧化剂或加热。机理研究表明,H-磷化合物的阳极氧化首先发生,直接产生关键的以 P 为中心的自由基,阴极还原导致分子氢或甲烷的同时释放。该协议具有操作简单、底物范围广、条件清洁温和、原子和步骤经济等特点,可形成含杂环的有机磷支架。
Photoredox-Catalyzed Synthesis of <i>C</i>-Benzoselenazolyl/Benzothiazolyl Glycosides from 2-Isocyanoaryl Selenoethers/Thioethers and Glycosyl Bromides
作者:Yi Jiao、Xiaoran Shi、Lei Ju、Shouyun Yu
DOI:10.1021/acs.orglett.3c04059
日期:2024.1.12
whereas Se has been less studied. Here, we described a photoredox strategy to synthesize C-benzoselenazolyl (Bs) glycosides from 2-isocyanoaryl selenoethers and glycosyl bromides. This reaction was carried out under mild conditions with high efficiency. C-Benzothiazolyl (Bt) glycosides could also be synthesized from 2-isocyanoaryl thioethers using this strategy. This method can access novel seleno/thiosugars
含有杂原子的分子,如 Se 和 S,在药物的发现和设计中发挥着不可或缺的作用,而 Se 的研究较少。在这里,我们描述了从 2-异氰基芳基硒醚和糖基溴合成C-苯并硒唑基 (Bs) 糖苷的光氧化还原策略。该反应在温和条件下进行且效率高。使用该策略也可以从 2-异氰基芳基硫醚合成C-苯并噻唑基 (Bt) 糖苷。该方法可以获取新型硒/硫糖,这将有利于含硒/硫药物的发现。
Metal-free photo-induced radical C-P and C-S bond formation for the synthesis of 2-phosphoryl benzothiazoles
We reveal here a visible-light promoted phosphorylation of 2-isocyanoaryl thioethers for the first time with concomitant C(sp(3))-S bond cleavage and imidoyl C-S formation. Additionally, this method features the use of 3 mol% organic dye Rose Bengal as the photocatalyst without external transition-metal or peroxide oxidants, and provides a novel and environmentally friendly approach for the preparation of a variety of 2-phosphoryl benzothiazoles in moderate to good yields. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
<i>ortho</i>-Lithiophenyl Isocyanide: A Versatile Precursor for 3<i>H</i>-Quinazolin-4-ones and 3<i>H</i>-Quinazolin-4-thiones
作者:Alexander V. Lygin、Armin de Meijere
DOI:10.1021/ol802659m
日期:2009.1.15
ortho-Lithiophenyl isocyanide has been generated from ortho-bromophenyl isocyanide and successfully employed toward the synthesis of 2-substituted phenyl isocyanides as well as 2,3-disubstituted 3H-quinazoline-4-ones and 3H-quinazolin-4-thiones.