A visible-light-induced/thiourea-mediated intramolecularcyclization of o-nitroarenes under mild conditions is realized for the first time, which provides an efficient and environmentally friendly way to access pharmaceutical relevant quinazolinone derivatives. The reaction can be easily extended to gram level by using a continuous-flow setup with high efficiency. Mechanistic investigation including
An efficient metal‐free, (NH4)2S2O8 mediated intramolecularoxidativecyclization for the construction of fused polycyclic quinazolinone derivatives under mild conditions was disclosed. This method provides an efficient and facile approach to the synthesis of polycyclic quinazolinone derivatives (> 40 examples), as well as the natural products tryptanthrin, rutaecarpine, and their analogues.
公开了在温和条件下用于构建稠合多环喹唑啉酮衍生物的高效无金属,(NH 4)2 S 2 O 8介导的分子内氧化环化反应。该方法为合成多环喹唑啉酮衍生物(> 40个实例)以及天然产物色胺酮,芸苔芸香碱及其类似物提供了一种高效简便的方法。
Synthesis of benzimidazoles via iridium-catalyzed acceptorless dehydrogenative coupling
作者:Xiang Sun、Xiao-Hui Lv、Lin-Miao Ye、Yu Hu、Yan-Yan Chen、Xue-Jing Zhang、Ming Yan
DOI:10.1039/c5ob00904a
日期:——
Benzimidazoles were prepared in good yieldsviathe iridium-catalyzed acceptorless dehydrogenative coupling of tertiary amines and arylamines.
苯并咪唑类化合物通过铱催化的受体无氧脱氢偶联反应,产率较高。
Redox condensation of o-halonitrobenzene with 1,2,3,4-tetrahydroisoquinoline: involvement of an unexpected auto-catalyzed redox cascade
作者:T. B. Nguyen、L. Ermolenko、A. Al-Mourabit
DOI:10.1039/c6cc01436d
日期:——
An uncatalyzed cascade of nucleophilic aromatic substitution, reduction of the nitro group, oxidation of the α-methylene group and condensation.
一连串未催化的亲核芳香取代反应,硝基团的还原,α-亚甲基基团的氧化和缩合。
Synthesis of 1,2-Fused/Disubstituted Benzimidazoles and Benzimidazolium Salts by I<sub>2</sub>-Mediated sp<sup>3</sup> C–H Amination
intramolecular sp3 C–H amination reaction of aniline derivatives has been established. This reaction employs molecular iodine (I2) under transition-metal-free conditions and produces 1,2-fused or 1,2-disubstituted benzimidazoles. This operationally simple synthetic process works well with N-substituted aniline substrates, forming novel benzimidazolium frameworks. Under the optimal reaction conditions, a broad variety
建立了苯胺衍生物的分子内sp 3 C-H胺化反应。该反应在无过渡金属的条件下使用分子碘 (I 2 ) 并生成 1,2-稠合或 1,2-二取代的苯并咪唑。这种操作简单的合成过程适用于N-取代苯胺底物,形成新型苯并咪唑骨架。在最佳反应条件下,多种 1,2-稠合/二取代苯并咪唑和苯并咪唑盐,包括几种生物活性化合物,以高效和可扩展的方式从易于获得的前体合成。